Re: [sage-support] Re: Listing all k-minors of a matrix?
Hi, the second solution is indeed very nice. I tested with A = Matrix(QQ, 2,3, [1,2,3,4,5,6]);A giving: [1 2 3] [4 5 6] res=[A[rows,cols] for cols in Combinations(A.ncols(),2) for rows in Combinations(A.nrows(),2)];res [[1 2] [4 5], [1 3] [4 6], [2 3] [5 6]] this is more or less my question this output is not really readable though correct. for i in range(len(res)):print res[i].det() -3 -6 -3 A.minors(2) [-3, -6, -3] And some different, how do Ishow output easier, is HERE a possibility to show a picture (screen capture) of sage-sheet? Greets Peter 2010/2/2 Jason Grout jason-s...@creativetrax.com On 02/01/2010 08:12 AM, javier wrote: You can see the source of the minors method using sage: M.minors?? (you need to have defined M beforehand). By browsing at that source one can easily find the general way of doing it: sage: A = Matrix(QQ, 3, [1,2,3,4,5,6,7,8,9]) sage: [A.matrix_from_rows_and_columns(rows, cols) for cols in combinations_iterator(range(A.ncols()), 2) for rows in combinations_iterator(range(A.nrows()),2)] [ [1 2] [1 2] [4 5] [1 3] [1 3] [4 6] [2 3] [2 3] [5 6] [4 5], [7 8], [7 8], [4 6], [7 9], [7 9], [5 6], [8 9], [8 9] ] Or slightly easier to read: sage: A = Matrix(QQ, 3, [1,2,3,4,5,6,7,8,9]) sage: [A[rows,cols] for cols in Combinations(A.ncols(),2) for rows in Combinations(A.nrows(),2)] [ [1 2] [1 2] [4 5] [1 3] [1 3] [4 6] [2 3] [2 3] [5 6] [4 5], [7 8], [7 8], [4 6], [7 9], [7 9], [5 6], [8 9], [8 9] ] Thanks, Jason -- Jason Grout -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.comsage-support%2bunsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Profiling code in Sage
On Feb 1, 2010, at 6:14 PM, Minh Nguyen wrote:
Hi Stefan,
On Tue, Feb 2, 2010 at 1:07 PM, Stefan
stefan.louis.no...@gmail.com wrote:
SNIP
Can anyone point me in the right direction for profiling a Python
function in Sage?
Here's an example on using prun from within Sage:
sage: %prun next_prime(10)
4 function calls in 0.000 CPU seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
10.0000.0000.0000.000 {method 'next_prime' of
'sage.rings.integer.Integer' objects}
10.0000.0000.0000.000 arith.py:772(next_prime)
10.0000.0000.0000.000 string:1(module)
10.0000.0000.0000.000 {method 'disable' of
'_lsprof.Profiler' objects}
For more information on the command prun(), see its doctring by
issuing the command prun?.
Note, however, that code passed to prun is not preparsed.
- Robert
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Re: [sage-support] can't build SAGE 4.3.1 for linux-powerpc32
Douglas Mencken wrote: I have a problem with building SAGE 4.3.1 for linux-powerpc32: checking lex output file root... configure: error: cannot find output from flex; giving up My distro is Fedora 12 Constantine, I have flex 2.5.35 installed by package management system (Package flex-2.5.35-7.fc12.ppc already installed and latest version) and there's also lex symlink to flex: $ ls -l `which lex` lrwxrwxrwx 1 root root 4 2009-11-18 18:57 /usr/bin/lex - flex Full output from make: -- $ make cd spkg ./install all 21 | tee -a ../install.log make[1]: Entering directory `/home/douglas/Desktop/SAGE/sage-4.3.1/spkg' base/dir-0.1-install ../data/ ../local/ ../local/etc ../local/lib ../local/bin ../local/include ../tmp/ /home/douglas/Desktop/SAGE/sage-4.3.1/spkg/build installed/ base/prereq-0.6-install Starting prerequisite check. Machine: Linux localhost 2.6.31.12-174.2.3.fc12.ppc #1 Mon Jan 18 19:36:45 UTC 2010 ppc ppc ppc GNU/Linux prereq-0.6/ prereq-0.6/configure prereq-0.6/configure.ac SNIP checking whether g++ accepts -g... yes checking dependency style of g++... gcc3 checking how to run the C preprocessor... gcc -E checking for flex... flex checking lex output file root... configure: error: cannot find output from flex; giving up ERROR: You do not have all of the prerequisites needed to build Sage from source. See the errors above. make[1]: *** [installed/prereq-0.6] Error 1 make[1]: Leaving directory `/home/douglas/Desktop/SAGE/sage-4.3.1/spkg' real0m21.657s user0m2.805s sys 0m2.803s Error building Sage. -- That is odd. flex is not specifically checked for in Sage - by that, I mean the word flex does not appear in the configure.ac file used to create the configure script you are running. I suspect autoconf automatically tests for flex. On my own system, which does not have flex, but has lex, I see: checking for flex... no checking for lex... lex checking lex output file root... lex.yy checking lex library... none needed checking whether yytext is a pointer... no checking for bison... no checking for byacc... no You could make a backup of the file spkg/base/prereq-0.6/configure, then edit out the following lines: if test -f lex.yy.c; then ac_cv_prog_lex_root=lex.yy elif test -f lexyy.c; then ac_cv_prog_lex_root=lexyy else as_fn_error cannot find output from $LEX; giving up $LINENO 5 fi and see what happens. We might find the build environment is broken in some other way, and flex is just a red herring. Did you install 'flex' from source? Did you run any self-tests it may have? If not, I'd try both. It may be your flex is broken, and you do not know it. Dave -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Strange behaviour of trig_expand
Here is some to-my-opinion strange behaviour of trig_expand :
#Declare real variables
var('a b c')
assume([a,'real'],[b,'real'],[c,'real'])
assumptions()
--- [a is real, b is real, c is real]
#Case 1
sin(a+b).trig_expand()
--- sin(a)*cos(b) + sin(b)*cos(a)
#Case 2
sin((a+b)/2).trig_expand()
--- sin(1/2*a)*cos(1/2*b) + sin(1/2*b)*cos(1/2*a)
#Case 3
sin((a+b)/c).trig_expand()
--- sin((a + b)/c)
#Case 4
sin((a/c+b/c)).trig_expand()
In case 3, the expansion is not done. I wonder if it would be possible
to do it. Obviously, if the sine argument was rational expanded before
trig expansion, it would work but none seem to work on the whole
expression.
Any idea ?
PS: I am actually using this in an expression where doing this
expansion would simplify a lot and I would have expected simplify_full
to see it... which it does not, I suspect because of this.
--- sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c)
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[sage-support] Re: Strange behaviour of trig_expand
Oops, case 4 ended at the end of the message...
On 2 fév, 15:06, Nicolas nicolas.fresseng...@gmail.com wrote:
Here is some to-my-opinion strange behaviour of trig_expand :
#Declare real variables
var('a b c')
assume([a,'real'],[b,'real'],[c,'real'])
assumptions()
--- [a is real, b is real, c is real]
#Case 1
sin(a+b).trig_expand()
--- sin(a)*cos(b) + sin(b)*cos(a)
#Case 2
sin((a+b)/2).trig_expand()
--- sin(1/2*a)*cos(1/2*b) + sin(1/2*b)*cos(1/2*a)
#Case 3
sin((a+b)/c).trig_expand()
--- sin((a + b)/c)
#Case 4
sin((a/c+b/c)).trig_expand()
In case 3, the expansion is not done. I wonder if it would be possible
to do it. Obviously, if the sine argument was rational expanded before
trig expansion, it would work but none seem to work on the whole
expression.
Any idea ?
PS: I am actually using this in an expression where doing this
expansion would simplify a lot and I would have expected simplify_full
to see it... which it does not, I suspect because of this.
--- sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c)
--
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[sage-support] Re: Strange behaviour of trig_expand
Dear Nicolas,
If you do
sage: a = sin((a+b)/c)
sage: a.trig_expand??
you will see the source code, which simply uses one of Maxima's
expansion routines, whose behavior should be documented on the Maxima
Sourceforge site. My suspicion is that Maxima declines to expand this
because c might be zero, though there could be another reason. We
have several Maxima experts who also read this list and might have
more detailed information, but this would be the first place I would
start. One idea might be to apply another simplification/expansion to
whatever you feed into your trig functions, before you expand the
rest.
Good luck, and please follow up with more details, or specific
proposals for how we can improve our documentation to help make it
clearer how this works. Thank you!
- kcrisman
On Feb 2, 9:06 am, Nicolas nicolas.fresseng...@gmail.com wrote:
Here is some to-my-opinion strange behaviour of trig_expand :
#Declare real variables
var('a b c')
assume([a,'real'],[b,'real'],[c,'real'])
assumptions()
--- [a is real, b is real, c is real]
#Case 1
sin(a+b).trig_expand()
--- sin(a)*cos(b) + sin(b)*cos(a)
#Case 2
sin((a+b)/2).trig_expand()
--- sin(1/2*a)*cos(1/2*b) + sin(1/2*b)*cos(1/2*a)
#Case 3
sin((a+b)/c).trig_expand()
--- sin((a + b)/c)
#Case 4
sin((a/c+b/c)).trig_expand()
In case 3, the expansion is not done. I wonder if it would be possible
to do it. Obviously, if the sine argument was rational expanded before
trig expansion, it would work but none seem to work on the whole
expression.
Any idea ?
PS: I am actually using this in an expression where doing this
expansion would simplify a lot and I would have expected simplify_full
to see it... which it does not, I suspect because of this.
--- sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c)
--
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[sage-support] Re: exponential and simplify
On Feb 1, 11:53 pm, Simon simonjty...@gmail.com wrote:
Thank you both for your replies.
It's interesting that in Andrej's examples, the e^x and exp(x) form do
not yield the same result,
since in maxima (which I know next to nothing about) we have
(%i1) declare(m, integer);
(%o1) done
(%i2) rectform(exp(2*m*%i*%pi));
(%o2) 1
(%i3) rectform(%e^(2*m*%i*%pi));
(%o3) 1
Is this a problem with the sage conversion?
Note these two different behaviours:
sage: var('m'); assume(m, 'integer')
m
sage: e^(i*2*pi*m)._maxima_().rectform()
e^(2*I*pi*m)
sage: exp(i*2*pi*m)._maxima_().rectform()
1
but (this was tested in a new sage/maxima session)
sage: var('m'); maxima('declare(m, integer)')
m
done
sage: maxima(e^(i*2*pi*m)).rectform()
1
sage: maxima(exp(i*2*pi*m)).rectform()
1
Interesting. This might be due to the fact that _maxima_() uses the
calculus copy of Maxima (with certain standard assumptions we like
in Sage, such as domain being complex), while maxima(foo) just uses
vanilla Maxima. This has arisen before, though I am not sure how many
people will read the documentation of maxima? before using it, and we
really do want to have the ability to launch a separate Maxima session
like this.
It is also possible that the Pynac representation of e^(i*2*pi*m)
differs from that of exp(i*2*pi*m) in such a way that _maxima_ would
address it differently with respect to the assumption, but that seems
less likely to me than the first possibility. I apologize for not
being able to diagnose this better right now.
- kcrisman
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[sage-support] Re: Listing all k-minors of a matrix?
On 02/02/2010 03:57 AM, Peter K.H. Gragert wrote: Hi, the second solution is indeed very nice. I tested with A = Matrix(QQ, 2,3, [1,2,3,4,5,6]);A giving: [1 2 3] [4 5 6] res=[A[rows,cols] for cols in Combinations(A.ncols(),2) for rows in Combinations(A.nrows(),2)];res [[1 2] [4 5], [1 3] [4 6], [2 3] [5 6]] this is more or less my question this output is not really readable though correct. for i in range(len(res)):print res[i].det() -3 -6 -3 A.minors(2) [-3, -6, -3] And some different, how do Ishow output easier, is HERE a possibility to show a picture (screen capture) of sage-sheet? You can upgrade your sage in order to take advantage of the nice printing you saw in our output: sage: A = Matrix(QQ, 2,3, [1,2,3,4,5,6]);A [1 2 3] [4 5 6] sage: res=[A[rows,cols] for cols in Combinations(A.ncols(),2) for rows in Combinations(A.nrows(),2)];res [ [1 2] [1 3] [2 3] [4 5], [4 6], [5 6] ] sage: [det(m) for m in res] [-3, -6, -3] Thanks, Jason -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Deleting Sage on Mac
Dear support, Has anyone ever had the following problem on Mac? I get this on both PPC and Intel. One has some Sage installations. One builds/downloads new ones. One puts the old ones in the Trash, and then tries to Empty Trash. Then one gets a whole bunch of messages like: The operation cannot be completed because the item libpari-gmp.dylib is in use Also for many .so files like real_lazy.so, and even python and sage- sage. Note that in these cases Sage has not been in use for many hours or even days, and the Terminal is closed. I've deleted these now, so I can't reproduce it again, but it did happen twice, which maybe counts. Are there processes running in the background that never stop, even after Sage is terminated? I only know how to use top very naively, so I didn't see any processes that seemed suspicious. Anyway, if there are, that would seem to be bad. - kcrisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Deleting Sage on Mac
Here is the result of ps, which I forgot about: PID TT STAT TIME COMMAND 22503 p1 S 0:00.04 -bash 23320 p1- S 9:50.62 python /Users/.../sage-4.1.2.rc1.alpha3-copy/ local/bin/sage-cleaner 5846 pb Ss+0:00.03 bash /Users/.../sage-4.1.2.rc2/sage -python - u 5853 pb S+ 0:00.04 bash /Users/.../sage-4.1.2.rc2/local/bin/ sage-sage -python -u 5865 pb S+ 0:00.09 python -u 3113 pc Ss+0:00.03 bash /Users/.../sage-4.1.2.rc1.alpha3-copy/ sage -python -u 3120 pc S+ 0:00.04 bash /Users/.../sage-4.1.2.rc1.alpha3-copy/ local/bin/sage-sage -python -u 3144 pc S+ 0:00.08 python -u 5593 q0 Ss 0:00.03 bash /Users/.../sage-4.1.2.rc2/sage -twistd --pidfile=tmpO_Yq8b/twistd.pid 5600 q0 S 0:00.04 bash /Users/.../sage-4.1.2.rc2/local/bin/ sage-sage -twistd --pidfile=tmpO_ 5614 q0 S 0:07.65 python /Users/.../sage-4.1.2.rc2/local/bin/ twistd --pidfile=tmpO_Yq8b/twis 2860 q1 Ss 0:00.03 bash /Users/.../sage-4.1.2.rc1.alpha3-copy/ sage -twistd --pidfile=tmpRsQnL 2867 q1 S 0:00.04 bash /Users/.../sage-4.1.2.rc1.alpha3-copy/ local/bin/sage-sage -twistd --p 2880 q1 S 0:07.93 python /Users/.../sage-4.1.2.rc1.alpha3-copy/ local/bin/twistd --pidfile=tm Note again that on this computer, Sage hasn't been run (and, afaik, was closed properly) in at least a week. And certainly sage-4.1.2.rc1/2 hadn't been run for months! Maybe it was a problem specific to those - or a bad termination of them? In which case I apologize for wasting bandwidth. But if someone knows what I did wrong, hopefully I can avoid doing it in the future, and maybe we can put a check in for it if people are similarly unlucky. - kcrisman On Feb 2, 10:32 am, kcrisman kcris...@gmail.com wrote: Dear support, Has anyone ever had the following problem on Mac? I get this on both PPC and Intel. One has some Sage installations. One builds/downloads new ones. One puts the old ones in the Trash, and then tries to Empty Trash. Then one gets a whole bunch of messages like: The operation cannot be completed because the item libpari-gmp.dylib is in use Also for many .so files like real_lazy.so, and even python and sage- sage. Note that in these cases Sage has not been in use for many hours or even days, and the Terminal is closed. I've deleted these now, so I can't reproduce it again, but it did happen twice, which maybe counts. Are there processes running in the background that never stop, even after Sage is terminated? I only know how to use top very naively, so I didn't see any processes that seemed suspicious. Anyway, if there are, that would seem to be bad. - kcrisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Profiling code in Sage
Hi Robert, On Tue, Feb 2, 2010 at 10:20 PM, Robert Bradshaw rober...@math.washington.edu wrote: SNIP Note, however, that code passed to prun is not preparsed. Good point. I think this is tracked at ticket #2054 http://trac.sagemath.org/sage_trac/ticket/2054 -- Regards Minh Van Nguyen -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Strange behaviour of trig_expand
Thanks for your answer !
Following your idea, ny playing around in maxima, I found that :
trigreduce(sin((a+b)/c))
sin(b/c+a/c)
Therefore
trigexpand(trigreduce(sin((a+b)/c)))
cos(a/c)*sin(b/c)+sin(a/c)*cos(b/c)
Which is what is wanted
but I did not find any trigreduce in sage
Any idea how I can do that directly in sage ?
On 2 fév, 16:15, kcrisman kcris...@gmail.com wrote:
Dear Nicolas,
If you do
sage: a = sin((a+b)/c)
sage: a.trig_expand??
you will see the source code, which simply uses one of Maxima's
expansion routines, whose behavior should be documented on the Maxima
Sourceforge site. My suspicion is that Maxima declines to expand this
because c might be zero, though there could be another reason. We
have several Maxima experts who also read this list and might have
more detailed information, but this would be the first place I would
start. One idea might be to apply another simplification/expansion to
whatever you feed into your trig functions, before you expand the
rest.
Good luck, and please follow up with more details, or specific
proposals for how we can improve our documentation to help make it
clearer how this works. Thank you!
- kcrisman
On Feb 2, 9:06 am, Nicolas nicolas.fresseng...@gmail.com wrote:
Here is some to-my-opinion strange behaviour of trig_expand :
#Declare real variables
var('a b c')
assume([a,'real'],[b,'real'],[c,'real'])
assumptions()
--- [a is real, b is real, c is real]
#Case 1
sin(a+b).trig_expand()
--- sin(a)*cos(b) + sin(b)*cos(a)
#Case 2
sin((a+b)/2).trig_expand()
--- sin(1/2*a)*cos(1/2*b) + sin(1/2*b)*cos(1/2*a)
#Case 3
sin((a+b)/c).trig_expand()
--- sin((a + b)/c)
#Case 4
sin((a/c+b/c)).trig_expand()
In case 3, the expansion is not done. I wonder if it would be possible
to do it. Obviously, if the sine argument was rational expanded before
trig expansion, it would work but none seem to work on the whole
expression.
Any idea ?
PS: I am actually using this in an expression where doing this
expansion would simplify a lot and I would have expected simplify_full
to see it... which it does not, I suspect because of this.
--- sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c)
--
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[sage-support] failed to built sage-4.3.1 on fedora 11
Hi,
I tried to built sage-4.3.1 on fedora 11 (amd phenom II X4),
when compiling pari a problem arised.
here are the relevant lines of install.log:
==
Shall we try to build pari 2.3.3 (released) now (y/n)? [n]
Ok. Type make install when you are ready
Bye !
Building and install PARI
make[2]: Entering directory `/scratch/bin/sage-4.3.1/spkg/build/
pari-2.3.3.p7/src'
Making gp in Olinux-x86_64
make[3]: Entering directory `/scratch/bin/sage-4.3.1/spkg/build/
pari-2.3.3.p7/src/Olinux-x86_64'
../config/genkernel ../src/kernel/x86_64/asm0.h parilvl0.h
cat ../src/kernel/gmp/tune.h ../src/kernel/gmp/int.h ../src/kernel/
none/level1.h parilvl1.h
cat parilvl0.h parilvl1.h pariinl.h
gcc -c -O1 -Wall -fno-strict-aliasing -fomit-frame-pointer-I. -
I../src/headers -I../src/language -I/scratch/bin/sage-4.3.1/local/
include -o gp.o ../src/gp/gp.c
cd ../src/desc /usr/bin/perl merge_822 ../functions/*/* def-linux-
x86_64-4090.tmp
mv ../src/desc/def-linux-x86_64-4090.tmp ../src/desc/pari.desc
cd ../src/desc /usr/bin/perl gen_proto gp pari.desc gp_init-linux-
x86_64-4090.tmp
mv ../src/desc/gp_init-linux-x86_64-4090.tmp ../src/gp/gp_init.h
gcc -c -O1 -Wall -fno-strict-aliasing -fomit-frame-pointer-I. -
I../src/headers -I../src/graph -o gp_init.o ../src/gp/gp_init.c
gcc -c -O1 -Wall -fno-strict-aliasing -fomit-frame-pointer-I. -
I../src/headers -I../src/language -I/scratch/bin/sage-4.3.1/local/
include -o gp_rl.o ../src/gp/gp_rl.c
cd ../src/desc /usr/bin/perl gen_proto highlevel pari.desc
highlvl-linux-x86_64-4090.tmp
mv ../src/desc/highlvl-linux-x86_64-4090.tmp ../src/gp/highlvl.h
gcc -c -O1 -Wall -fno-strict-aliasing -fomit-frame-pointer-I. -
I../src/headers -DDL_DFLT_NAME=NULL -o highlvl.o ../src/gp/highlvl.c
gcc -c -O1 -Wall -fno-strict-aliasing -fomit-frame-pointer-I. -
I../src/headers -o whatnow.o ../src/gp/whatnow.c
gcc -c -O1 -Wall -fno-strict-aliasing -fomit-frame-pointer-I. -
I../src/headers -I../src/graph -o plotport.o ../src/graph/plotport.c
g++ -c -O1 -Wall -fno-strict-aliasing -fomit-frame-pointer-I. -I../
src/headers -I/usr/local/include -o plotfltk.o ../src/graph/
plotfltk.c
../src/graph/plotfltk.c:27:19: error: FL/Fl.H: No such file or
directory
../src/graph/plotfltk.c:28:26: error: FL/Fl_Window.H: No such file or
directory
../src/graph/plotfltk.c:29:24: error: FL/fl_draw.H: No such file or
directory
../src/graph/plotfltk.c:31: error: expected class-name before '{'
token
../src/graph/plotfltk.c:45: error: 'Fl_Color' does not name a type
../src/graph/plotfltk.c:48: error: 'Fl_Color' does not name a type
../src/graph/plotfltk.c: In constructor 'Plotter::Plotter(long int*,
long int*, long int*, long int, const char*)':
../src/graph/plotfltk.c:56: error: class 'Plotter' does not have any
field named 'Fl_Window'
../src/graph/plotfltk.c:60: error: 'color' was not declared in this
scope
../src/graph/plotfltk.c:60: error: 'FL_WHITE' was not declared in this
scope
../src/graph/plotfltk.c:61: error: 'FL_BLACK' was not declared in this
scope
../src/graph/plotfltk.c:62: error: 'FL_BLUE' was not declared in this
scope
../src/graph/plotfltk.c:63: error: 'rgb_color' was not declared in
this scope
../src/graph/plotfltk.c:64: error: 'FL_RED' was not declared in this
scope
../src/graph/plotfltk.c:65: error: 'FL_GREEN' was not declared in this
scope
../src/graph/plotfltk.c: In function 'void DrawPoint(void*, long int,
long int)':
../src/graph/plotfltk.c:73: error: 'fl_point' was not declared in this
scope
../src/graph/plotfltk.c: In function 'void DrawLine(void*, long int,
long int, long int, long int)':
../src/graph/plotfltk.c:79: error: 'fl_line' was not declared in this
scope
../src/graph/plotfltk.c: In function 'void DrawRectangle(void*, long
int, long int, long int, long int)':
../src/graph/plotfltk.c:85: error: 'fl_rect' was not declared in this
scope
../src/graph/plotfltk.c: In function 'void DrawPoints(void*, long int,
plot_points*)':
../src/graph/plotfltk.c:92: error: 'fl_point' was not declared in this
scope
../src/graph/plotfltk.c: In function 'void SetForeground(void*, long
int)':
../src/graph/plotfltk.c:97: error: 'Fl_Color' was not declared in this
scope
../src/graph/plotfltk.c:97: error: 'color' was not declared in this
scope
../src/graph/plotfltk.c:97: error: expected primary-expression before
')' token
../src/graph/plotfltk.c:97: error: expected ';' before 'data'
../src/graph/plotfltk.c:98: error: 'fl_color' was not declared in this
scope
../src/graph/plotfltk.c: In function 'void DrawLines(void*, long int,
plot_points*)':
../src/graph/plotfltk.c:105: error: 'fl_line' was not declared in this
scope
../src/graph/plotfltk.c: In function 'void DrawString(void*, long int,
long int, char*, long int)':
../src/graph/plotfltk.c:111: error: 'fl_draw' was not declared in this
scope
../src/graph/plotfltk.c: In member function 'void Plotter::draw()':
../src/graph/plotfltk.c:118: error: 'class Plotter' has no
[sage-support] Re: Strange behaviour of trig_expand
On Feb 2, 3:06 pm, Nicolas nicolas.fresseng...@gmail.com wrote:
Here is some to-my-opinion strange behaviour of trig_expand :
#Declare real variables
var('a b c')
assume([a,'real'],[b,'real'],[c,'real'])
assumptions()
--- [a is real, b is real, c is real]
#Case 1
sin(a+b).trig_expand()
--- sin(a)*cos(b) + sin(b)*cos(a)
#Case 2
sin((a+b)/2).trig_expand()
--- sin(1/2*a)*cos(1/2*b) + sin(1/2*b)*cos(1/2*a)
#Case 3
sin((a+b)/c).trig_expand()
--- sin((a + b)/c)
#Case 4
sin((a/c+b/c)).trig_expand()
In case 3, the expansion is not done. I wonder if it would be possible
to do it. Obviously, if the sine argument was rational expanded before
trig expansion, it would work but none seem to work on the whole
expression.
Any idea ?
PS: I am actually using this in an expression where doing this
expansion would simplify a lot and I would have expected simplify_full
to see it... which it does not, I suspect because of this.
--- sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c)
Sage will expand (x+y)/2 into x/2 + y/2, so trig_expand does what you
expect. But it leaves (x+y)/a as (x+y)/a, so trig_expand does not
change it.
sage: sin((x+y)/2)
sin(1/2*x + 1/2*y)
sage: sin((x+y)/2).trig_expand()
sin(1/2*x)*cos(1/2*y) + sin(1/2*y)*cos(1/2*x)
sage: sin((x+y)/a)
sin((x + y)/a)
sage: sin((x+y)/a).trig_expand()
sin((x + y)/a)
I don't know how to change sin((x+y)/a) to sin(x/a + y/a) in Sage,
maybe someone else can help you with that.
HTH, Andrej
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[sage-support] Re: Cannot run Sage
On Jan 30, 7:06 am, Alex Ghitza aghi...@gmail.com wrote: On Sat, 30 Jan 2010 18:01:45 +1100, Alex Ghitza aghi...@gmail.com wrote: I will make a new binary distribution and upload it somewhere, and I'll send you the link when that's done. It's basically done; I am getting it compressed with lzma right now, so it should be ready in about 30 minutes, and available at http://sage.math.washington.edu/home/ghitza/sage-archlinux-32bit-4.3 Best, Alex Is it still up? If not, a fix is available somewhere? I just ran into this problem (arch 32bit also) today -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] How to contour_plot piecewise defined function?
Hi! I've got a few functions like this: f1(x,y)=sin(x)+cos(y) f2(x,y)=sin(y)+cos(x) and I need to plot counter graphics like: contour_plot(lambda x,y:f1(x,y),(x,0,3),(y,0,14))+contour_plot(lambda x,y:f2(x,y),(x,3,6),(y,0,14)) can i do this easily using piecewise function? g=Piecewise([ [(0,3),f1], [(3,6),f2] ]) -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] failed to built sage-4.3.1 on fedora 11
Hi Georg, On Wed, Feb 3, 2010 at 4:10 AM, ggrafendorfer georg.grafendor...@gmail.com wrote: SNIP ../src/graph/plotfltk.c:193: error: 'class Plotter' has no member named 'show' ../src/graph/plotfltk.c:194: error: 'Fl' has not been declared make[3]: *** [plotfltk.o] Error 1 make[3]: Leaving directory `/scratch/bin/sage-4.3.1/spkg/build/ The pari spkg specifically uses the option --graphic=none to configure pari 2.3.3. However, that option is ignored in this case. The upshot is that pari should not be configured to use graphics libraries. The library fltk is one of them. I'm not experienced with fedora, can anybody tell me which package is missing and should be installed, or whatever is going on here. Ticket #7979 [1] is tracking the issue. The ticket has an updated spkg. A workaround is to delete the following pari package on your system SAGE_ROOT/spkg/standard/pari-2.3.3.p7.spkg Then download the updated spkg at #7979 and put the updated spkg under SAGE_ROOT/spkg/standard/ This should replace the previous version .p7 of the pari spkg. Then from SAGE_ROOT, run make again to resume the compilation of Sage. Hope that helps. [1] http://trac.sagemath.org/sage_trac/ticket/7979 -- Regards Minh Van Nguyen -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Profiling code in Sage
On Tue, Feb 2, 2010 at 7:50 AM, Minh Nguyen nguyenmi...@gmail.com wrote: Hi Robert, Note, however, that code passed to prun is not preparsed. Good point. I think this is tracked at ticket #2054 http://trac.sagemath.org/sage_trac/ticket/2054 I've put a patch up which fixes this by doing something similar to #797. --Mike -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Strange behaviour of trig_expand
On 2 ún, 18:11, andrejv andrej.vodopi...@gmail.com wrote: I don't know how to change sin((x+y)/a) to sin(x/a + y/a) in Sage, maybe someone else can help you with that. This is expand from Maxima sage: sin((a+b)/c)._maxima_().expand().sage() sin(a/c + b/c) Robert -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] orthogonal subspace?
I can't find a method for a vector space (or perhaps a subspace of a vector space) for orthogonal subspace. Since vector space seem to be equipped with an inner product this seems like a natural function to have. Am I missing something? If not, I vote that it should be added. Victor -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Strange behaviour of trig_expand
On 2 ún, 17:38, Nicolas nicolas.fresseng...@gmail.com wrote: Thanks for your answer ! Following your idea, ny playing around in maxima, I found that : trigreduce(sin((a+b)/c)) sin(b/c+a/c) Therefore trigexpand(trigreduce(sin((a+b)/c))) cos(a/c)*sin(b/c)+sin(a/c)*cos(b/c) Which is what is wanted but I did not find any trigreduce in sage Any idea how I can do that directly in sage ? sage: sin((a+b)/c)._maxima_().trigreduce().trigexpand().sage() sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c) sage: sin((a+b)/c)._maxima_().expand().trigexpand().sage() sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c) btw: I attemepted to include trigreduce by http://trac.sagemath.org/sage_trac/ticket/7334 . However, there was an idea not to add new functions to Sage, but rewrite simpification rules in Sage. See the discussion attached to trac 7334 and the link to sage-devel: http://groups.google.cz/group/sage-devel/browse_thread/thread/3899a578da747009 and look forward to Sage 4.3 :) Robert -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] orthogonal subspace?
Hello, On Tue, Feb 2, 2010 at 12:08 PM, VictorMiller victorsmil...@gmail.com wrote: I can't find a method for a vector space (or perhaps a subspace of a vector space) for orthogonal subspace. Since vector space seem to be equipped with an inner product this seems like a natural function to have. Am I missing something? If not, I vote that it should be added. This is http://trac.sagemath.org/sage_trac/ticket/7522. I think some work was done on it a few weeks ago, but I'm not sure what the current status is. --Mike -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: Cannot run Sage
On Tue, 2 Feb 2010 09:16:52 -0800 (PST), Drini pdsanc...@gmail.com wrote: Is it still up? If not, a fix is available somewhere? I just ran into this problem (arch 32bit also) today Yes, try http://modular.math.jmu.edu/linux/32bit/sage-4.3.1-fat-archlinux-i686-Linux.tar.lzma (Other mirrors might have it as well by now.) Best, Alex -- Alex Ghitza -- Lecturer in Mathematics -- The University of Melbourne -- Australia -- http://www.ms.unimelb.edu.au/~aghitza/ -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Fwd: using sage -tp vs testall
Hi folks, The following forwarded message is from someone who wasn't able to directly send to this list. -- Regards Minh Van Nguyen -- Forwarded message -- From: ross k ros...@gmail.com Date: Wed, Feb 3, 2010 at 8:40 AM Subject: Fwd: using sage -tp vs testall To: Minh Nguyen nguyenmi...@gmail.com Minh Sorry to send this to you directly. Tried sending this to sage-devel but I think I need to request membership before I can post there all the best Ross -- Forwarded message -- From: ross k ros...@gmail.com Date: Wed, Feb 3, 2010 at 7:50 AM Subject: using sage -tp vs testall To: sage-de...@googlegroups.com Hi The thrust of this post is how do I use sage -tp properly... I just got access to a new machine (Not sure at the moment but its either 4 or 8 core). Id like to do the equivalent to sage -testall using sage -tp Is the equivalent command sage -long -optional? (When I looked at sage -advanced, in the description of -testall, theres mention of testing examples as well, but not in the description of -tp) How do I do ALL the tests using -tp and if I have say a 4 core machine what options do I pass to -tp In particular, how do I work out how many threads to use? Finally if I re-run the tests that fail in parallel but pass non-parallel (as mentioned in included email below), should I consider them as passed or report them? Despite the multiple questions, Im really just asking, how do I use sage -tp properly... Hope this makes sense and was the right forum Ross Hi Alex, On Mon, Feb 1, 2010 at 11:54 PM, Alex Ghitza aghi...@gmail.com wrote: SNIP The following tests failed: sage -t -long devel/sage/sage/parallel/decorate.py # Segfault This only seems to happen when I run the whole testsuite. If I try to run this test on its own, it always passes. (I had the same issue in alpha0.) It could just be something that only comes up under stress -- I was testing things in parallel with 16 threads. Anyway, I don't think we can do much about it right now. The above failure often comes up when performing parallel doctests on mod.math. I have seen it many times during the Sage 4.3.2 release milestone. However, when it is run by itself, not part of a parallel doctest of the whole Sage library, it would pass. Sometimes it would also pass during a parallel doctest on mod.math. -- Regards Minh Van Nguyen -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: using sage -tp vs testall
Hi Ross, On Wed, Feb 3, 2010 at 8:50 AM, Minh Nguyen nguyenmi...@gmail.com wrote: SNIP The thrust of this post is how do I use sage -tp properly... See the Developers' Guide, especially the sections Parallel testing many modules [1] and Parallel testing the whole Sage library [2]. Id like to do the equivalent to sage -testall using sage -tp Is the equivalent command sage -long -optional? Not quite. The option -testall is equivalent to doctesting the whole Sage library and standard documentation using -t. So if you want to do ./sage -testall you could issue the following equivalent command: ./sage -t devel/sage-main/ You can think of them as synonymous with each other. The incantation ./sage -testall is much shorter than explicitly specifying the the main branch of your Sage installation. How do I do ALL the tests using -tp and if I have say a 4 core machine what options do I pass to -tp If you want to use 4 threads for parallel doctesting, you could do ./sage -tp 4 devel/sage-main/ or replace devel/sage-main/ with the directory to you want to perform parallel doctest on. For example, the command ./sage -tp 4 devel/sage-main/sage only performs parallel doctest on the whole Sage library. See the chapter Parallel Testing the Sage Library [3] of the Developers' Guide for more information. In particular, how do I work out how many threads to use? On a multiuser system such as a machine within the Sage cluster, I often use about a quarter of the total number of cores on that machine. This allows other developers to run parallel build/doctests. The number of threads to use for parallel doctesting depends on your machine (and how nice you want to be :-). Finally if I re-run the tests that fail in parallel but pass non-parallel (as mentioned in included email below), should I consider them as passed or report them? Please report such situations. Despite the multiple questions, Im really just asking, how do I use sage -tp properly... The Developers' Guide has a chapter on parallel doctesting. In any case, don't hesitate to ask if it doesn't make sense or lacks clarification. [1] http://www.sagemath.org/doc/developer/doctesting.html#parallel-testing-many-modules [2] http://www.sagemath.org/doc/developer/doctesting.html#parallel-testing-the-whole-sage-library [3] http://www.sagemath.org/doc/developer/doctesting.html -- Regards Minh Van Nguyen -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Cannot run Sage
On Feb 2, 10:01 pm, Alex Ghitza aghi...@gmail.com wrote: (Other mirrors might have it as well by now.) I'm afraid, no. They have shut down the master server more than a day ago, I don't know what has happened ... :( H -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] How to contour_plot piecewise defined function?
I personally don't see how off the top of my head, but if you figure out a way to do it, please post it! Maybe reading to source code of Piecewise and/or contour_plot might help? On Tue, Feb 2, 2010 at 1:00 PM, Eugene Goldberg omegat...@gmail.com wrote: Hi! I've got a few functions like this: f1(x,y)=sin(x)+cos(y) f2(x,y)=sin(y)+cos(x) and I need to plot counter graphics like: contour_plot(lambda x,y:f1(x,y),(x,0,3),(y,0,14))+contour_plot(lambda x,y:f2(x,y),(x,3,6),(y,0,14)) can i do this easily using piecewise function? g=Piecewise([ [(0,3),f1], [(3,6),f2] ]) -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: can't build SAGE 4.3.1 for linux-powerpc32
Dave, thank you for reply! Building flex from source solved this issue. So it is definitely the problem with Fedora repos. And sorry for your time. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Strange behaviour of trig_expand
On Feb 2, 3:10 pm, ma...@mendelu.cz ma...@mendelu.cz wrote: On 2 ún, 17:38, Nicolas nicolas.fresseng...@gmail.com wrote: Thanks for your answer ! Following your idea, ny playing around in maxima, I found that : trigreduce(sin((a+b)/c)) sin(b/c+a/c) Therefore trigexpand(trigreduce(sin((a+b)/c))) cos(a/c)*sin(b/c)+sin(a/c)*cos(b/c) Which is what is wanted but I did not find any trigreduce in sage Any idea how I can do that directly in sage ? sage: sin((a+b)/c)._maxima_().trigreduce().trigexpand().sage() sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c) sage: sin((a+b)/c)._maxima_().expand().trigexpand().sage() sin(a/c)*cos(b/c) + sin(b/c)*cos(a/c) btw: I attemepted to include trigreduce byhttp://trac.sagemath.org/sage_trac/ticket/7334 . However, there was an idea not to add new functions to Sage, but rewrite simpification rules in Sage. See the discussion attached to trac 7334 and the link to sage-devel:http://groups.google.cz/group/sage-devel/browse_thread/thread/3899a57... and look forward to Sage 4.3 :) This is another reason for us not to get all finicky about structure, but just add the functionality. If we wait for someone to recategorize simplification/expansion (or to write it natively in Sage), problems like this will keep showing up. The philosophy of Sage was to do it, not to wait for perfection, I think. Sorry for being grumpy, but this has come up many times in the few months since we last had this discussion. - kcrisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: orthogonal subspace?
On Feb 2, 3:23 pm, Mike Hansen mhan...@gmail.com wrote: Hello, On Tue, Feb 2, 2010 at 12:08 PM, VictorMiller victorsmil...@gmail.com wrote: I can't find a method for a vector space (or perhaps a subspace of a vector space) for orthogonal subspace. Since vector space seem to be equipped with an inner product this seems like a natural function to have. Am I missing something? If not, I vote that it should be added. This ishttp://trac.sagemath.org/sage_trac/ticket/7522. I think some work was done on it a few weeks ago, but I'm not sure what the current status is. You are right that it is natural to have! This ticket just needs to be turned into a documented patch. Neither Jason nor I have had time to do this, but as you can see one could do it by hand for now, and hopefully someone will do it properly soon. Apologies (at least to myself) for not having done so myself by now. - kcrisman -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] openMPI and MPI4PY?
Are openMPI and MPI4PY included in the SAGE distribution? I see MPI4PY mentioned here: http://www.sagemath.org/doc/numerical_sage/mpi4py.html Also, this blog http://www.sagemath.org/doc/numerical_sage/mpi4py.html says that openMPI is included when you install SAGE. I don't see how that's possible as I just spent several days trying to figure out how to setup openMPI on my cluster. Between setting up public key ssh authentication and torque servers, it was not trivial. TIA, A. Jorge Garcia http://calcpage.tripod.com Teacher Professor Applied Mathematics, Physics Computer Science Baldwin Senior High School Nassau Community College -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: sage blog
All I know is this is my feed: http://calcpage.tripod.com/shadowfax/rss.xml does that help? HTH, A. Jorge Garcia http://calcpage.tripod.com Teacher Professor Applied Mathematics, Physics Computer Science Baldwin Senior High School Nassau Community College -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] how to cast finite field elements into p-adic ring
Hi, After I create the residue field of a p-adic ring, how do I cast elements of the field back into the ring? Any lift is fine. The obvious thing doesn't work: sage: R.z = Zq(9) sage: F = R.residue_class_field() sage: F Finite Field in z0 of size 3^2 sage: a = F.gen() sage: R(a) --- TypeError Also, is it possible to change the name of the generator of the residue field? david -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] openMPI and MPI4PY?
Hi, On Wed, Feb 3, 2010 at 1:36 PM, calcp...@aol.com wrote: Are openMPI and MPI4PY included in the SAGE distribution? No. Both Open MPI and mpi4py are not part of the Sage standard repository. For what's available in the repository of standard packages, see the page for standard spkg's [1]. However, if you want to use Open MPI and mpi4py, they are available as optional spkg's [2]. I see MPI4PY mentioned here: http://www.sagemath.org/doc/numerical_sage/mpi4py.html Also, this blog http://www.sagemath.org/doc/numerical_sage/mpi4py.html says that openMPI is included when you install SAGE. I don't see how that's possible as I just spent several days trying to figure out how to setup openMPI on my cluster. The numerical guide [3] is rather outdated. No one has yet volunteered to update/rewrite it. [1] http://www.sagemath.org/packages/standard/ [2] http://www.sagemath.org/packages/optional/ [3] http://www.sagemath.org/doc/numerical_sage/ -- Regards Minh Van Nguyen -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: sage blog
Hi, On Wed, Feb 3, 2010 at 1:50 PM, calcp...@aol.com wrote: All I know is this is my feed: http://calcpage.tripod.com/shadowfax/rss.xml does that help? That actually feeds every update from your blog to an aggregator. People who subscribe to Planet Sage often do so for Sage specific posts. To aggregate any update from a blog, regardless of whether it's Sage specific or otherwise, would really annoy subscribers. -- Regards Minh Van Nguyen -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Text Editor for Sage
Hi All, I'm new to Sage/Sun VirtualBox (Windows Vista x64). I can open sage: prompt, Sage Notebook (Firefox icon), no problem. I'm trying to work on some programming (Sage Tutorials Release 4.3.1, Chapter 5). The question I have is how do I create/open/edit a sage file. Is there a simple text editor, like Window's notepad that I can use to write the code. For example, the tutorial suggests that I create a file called example.sage with the following content: print Hello World print 2^2 I can't figure out how to complete this task. I tried right clicking on the VirtualBox desktop and select Create from Template, then Empty File. It'll let me create a file called example.sage. Double clicking on it opens a window telling me that I should associate it with some application which I don't have (So far, I only see Firefox Web Browser, Orage, and Sun Java 6 Web Start). I tried to find example.sage in Windows, by searching for it, but that yield no result. So do I need another application, like another .ovf file for text editing? Please help, Thank you! Georges -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: how to cast finite field elements into p-adic ring
Something seems to be broken in extensions of p-adics. Here are two examples: sage: R.z = Zq(9) sage: R.residue_system() TypeError: cannot convert x to a p-adic element and sage: el=R.random_element() sage: el.slice(el.valuation(),el.valuation()+1) TypeError: 'sage.rings.padics.padic_ZZ_pX_CA_element.pAdicZZpXCAElement' object cannot be interpreted as an index Otherwise I saw there is a parameter res_name to be passed to constructor: sage: R.z = Zq(9,res_name=x) but then x is not really bound to anything. sage: x*3 3*x Sorry, can't be of much help. Even this trick didn't work sage: R2.z = Zq(9,1) sage: R(z) NotImplementedError: Conversion from different p-adic extensions not yet supported Rado On Feb 2, 9:04 pm, dmharvey dmhar...@cims.nyu.edu wrote: Hi, After I create the residue field of a p-adic ring, how do I cast elements of the field back into the ring? Any lift is fine. The obvious thing doesn't work: sage: R.z = Zq(9) sage: F = R.residue_class_field() sage: F Finite Field in z0 of size 3^2 sage: a = F.gen() sage: R(a) --- TypeError Also, is it possible to change the name of the generator of the residue field? david -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
