Re: [sage-support] Re: Evaluating Symbolic Expressions
In order to anticipate the next question, if you are wotking in a script
instead of
the terminal.
The code
f(x,y)=x*y
print f(5,4)
raises
SyntaxError: can't assign to function call
The code
x,y=var('x,y')
f=x*y
print f(4,3)
raises
DeprecationWarning: Substitution using function-call syntax and unnamed
arguments is deprecated and will be removed from a future release of
Sage; you can use named arguments instead, like EXPR(x=..., y=...)
I know two correct ways to do that :
x,y=var('x,y')
f=x*y
print f(x=4,y=3)
or
x,y=var('x,y')
f=symbolic_expression(x*y).function(x,y)
print f(x,y)
Remark that
f=symbolic_expression(x*cos(y)).function(x,y)
print f(0,1)# 0
g=symbolic_expression(x*cos(y)).function(y,x)
print g(0,1)# 1!!
Hope it helps in any way
Laurent
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Re: [sage-support] Re: Evaluating Symbolic Expressions
On Wed, Nov 2, 2011 at 12:08 PM, Laurent moky.m...@gmail.com wrote:
In order to anticipate the next question, if you are wotking in a script
instead of
the terminal.
The code
f(x,y)=x*y
print f(5,4)
raises
SyntaxError: can't assign to function call
The code
x,y=var('x,y')
f=x*y
print f(4,3)
raises
DeprecationWarning: Substitution using function-call syntax and unnamed
arguments is deprecated and will be removed from a future release of Sage;
you can use named arguments instead, like EXPR(x=..., y=...)
I know two correct ways to do that :
x,y=var('x,y')
f=x*y
print f(x=4,y=3)
or
x,y=var('x,y')
f=symbolic_expression(x*y).function(x,y)
print f(x,y)
Remark that
f=symbolic_expression(x*cos(y)).function(x,y)
print f(0,1) # 0
g=symbolic_expression(x*cos(y)).function(y,x)
print g(0,1) # 1!!
Hope it helps in any way
Laurent
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Hi,
I think its a issue of parsing. If your file is called hello.py it
gives the errors you mentioned. However if you call your file
hello.sage it works. If you call your file hello.sage and run
sage hello.sage
it generates a hello.py which I append below -
# This file was *autogenerated* from the file temp.sage.
from sage.all_cmdline import * # import sage library
_sage_const_5 = Integer(5); _sage_const_4 = Integer(4)
var('x,y')
__tmp__=var(x,y); f = symbolic_expression(x*y).function(x,y)
print f(_sage_const_5 ,_sage_const_4 )
I think you can now figure out how it is working. Hope it helps.
Rajeev
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Re: [sage-support] Re: Numerical solution of systems of nonlinear (in)equalities
1) solve doesn't work in my example. 2) I wonder whether fsolve could solve really *systems *of (in)equalities or only one (in)equality. Best regards, Urs Hackstein 2011/10/31 achrzesz achrz...@wp.pl 1) solve? (some nonlinear systems are solved numerically) 2) from scipy.optimize import fsolve fsolve? 3) from mpmath import findroot findroot? -- 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
Re: [sage-support] import .sage file [was : Evaluating Symbolic Expressions]
Hi, I think its a issue of parsing. If your file is called hello.py it gives the errors you mentioned. However if you call your file hello.sage it works. If you call your file hello.sage and run sage hello.sage it generates a hello.py which I append below - I know that, but I never understood how to use it because if my file is named hello.sage, I cannot do import hello.sage in an other file. But if it is named hello.py, I can write import hello I admit I never got trough the doc about that issue ;) Laurent -- 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: Creating Arrays in sage, and then writing a programme which refers back to the array and uses it.
yes I am just trying to reasign totol prob again so that a new value of total prob comes out . On Nov 1, 12:24 am, Dan Drake dr...@kaist.edu wrote: On Mon, 31 Oct 2011 at 03:09PM -0700, Chappman wrote: Hi folks, I am relatively new to programming in Sagemath, and I am trying to find a method in of creating a n x n array, with probabilities as the entries of this array . Use a matrix, or even simpler, a list of lists. sage: m = matrix(3, [[1, 2, 3], [4,5,6], [7,8,9]]) Here's the tricky part, then I have to create a coding program which uses the values in this array. For i=1 to 5; For j=1 to i-1; total_prob= (some type of simple formula which refers back to entries in the array) end; end; It looks like you're just reassigning total_prob again and again. Is that what you want? Dan -- --- Dan Drake - http://mathsci.kaist.ac.kr/~drake --- signature.asc 1KViewDownload -- 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: Numerical solution of systems of nonlinear (in)equalities
Hello Urs fsolve from scipy does solve systems (look at scipy reference) All functions I have mentioned solve nonlinear systems of *equations* Maxima has also function mnewton solving nonlinear systems Andrzej Chrzeszczyk -- 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: sagenb issues
I am not sure whether my problem has anything to do with the topic of
this thread...
I want to define a Power Series Ring over QQ. The following code works
perfectly fine on my local computer (Ubuntu 11.10, Sage Version 4.7.1,
Release Date: 2011-08-11), whereas if I give the same on sagenb.org it
gives me an error.
I am defining the ring via:
R.x,y,z = PowerSeriesRing(QQ);
The error on sagenb:
Traceback (most recent call last):
File stdin, line 1, in module
File _sage_input_5.py, line 10, in module
exec compile(u'open(___code___.py,w).write(# -*- coding:
utf-8 -*-\\n +
_support_.preparse_worksheet_cell(base64.b64decode(Ui48eCx5LHo+ID0gUG93ZXJTZXJpZXNSaW5nKFFRKQpS),globals())+\\n);
execfile(os.path.abspath(___code___.py))
File , line 1, in module
File /tmp/tmpHLLnj7/___code___.py, line 2, in module
R = PowerSeriesRing(QQ, names=('x', 'y', 'z',)); (x, y, z,) =
R._first_ngens(3)
File
/sagenb/sage_install/sage-4.7/local/lib/python2.6/site-packages/sage/rings/power_series_ring.py,
line 183, in PowerSeriesRing
name = gens.normalize_names(1, name)
File parent_gens.pyx, line 213, in
sage.structure.parent_gens.normalize_names
(sage/structure/parent_gens.c:2311)
IndexError: the number of names must equal the number of generators
My observation is if I fedine a Power Series Ring in 1 variable, then
sagenb accepts, but it seems it doesnt like multiple variables. In fact
none of the example in the documentation work for that matter. Please let
me know if there is some other issue involved...
Thanks and regards
-- VInay
On 28 October 2011 01:36, leif not.rea...@online.de wrote:
On 27 Okt., 19:12, Volker Braun vbraun.n...@gmail.com wrote:
On Thursday, October 27, 2011 11:01:19 AM UTC-4, leif wrote:
Setting MAKE to make -jN when (re-)building Sage doesn't limit the
*total* number of build jobs to N;
It does limit the total number of build jobs within the current make.
Provided the communication to the jobserver (through inherited file
descriptors, whose numbers are passed in MAKEFLAGS) isn't broken,
which currently apparently isn't always the case during the build.
Of
course it doesn't take into account make jobs that are run by different
users, that run on different computers, that were invoked at a different
time, etc.
:-) I thought the number referred to all simultaneous 'make' jobs in
the Milky Way.
-leif
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[sage-support] Re: sagenb issues
On 11/2/11 10:15 AM, Vinay Wagh wrote: I am not sure whether my problem has anything to do with the topic of this thread... I want to define a Power Series Ring over QQ. The following code works perfectly fine on my local computer (Ubuntu 11.10, Sage Version 4.7.1, Release Date: 2011-08-11), whereas if I give the same on sagenb.org http://sagenb.org it gives me an error. sagenb.org is running Sage 4.7. My guess is that is the problem here. 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
Re: [sage-support] Re: sagenb issues
On 2 November 2011 20:49, Jason Grout jason-s...@creativetrax.com wrote: On 11/2/11 10:15 AM, Vinay Wagh wrote: I am not sure whether my problem has anything to do with the topic of this thread... I want to define a Power Series Ring over QQ. The following code works perfectly fine on my local computer (Ubuntu 11.10, Sage Version 4.7.1, Release Date: 2011-08-11), whereas if I give the same on sagenb.org http://sagenb.org it gives me an error. sagenb.org is running Sage 4.7. My guess is that is the problem here. Thanks, Jason I also suspected the same, but the documentation doesnot say anywhere that the 4.7 does not support multi-var power series... (Or at least I couldnt find!) Thanks and regards -- Vinay -- 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: sagenb issues
On Wed, Nov 2, 2011 at 8:32 AM, Vinay Wagh wagh...@gmail.com wrote: On 2 November 2011 20:49, Jason Grout jason-s...@creativetrax.com wrote: On 11/2/11 10:15 AM, Vinay Wagh wrote: I am not sure whether my problem has anything to do with the topic of this thread... I want to define a Power Series Ring over QQ. The following code works perfectly fine on my local computer (Ubuntu 11.10, Sage Version 4.7.1, Release Date: 2011-08-11), whereas if I give the same on sagenb.org http://sagenb.org it gives me an error. sagenb.org is running Sage 4.7. My guess is that is the problem here. Thanks, Jason I also suspected the same, but the documentation doesnot say anywhere that the 4.7 does not support multi-var power series... (Or at least I couldnt find!) Sage has multivariate power series now! Cool. I remember people talking about implementing them periodically for 6 years, and never doing it. I'm glad it's done now. Note that http://test.sagenb.org/ has a newer version of sage. -- William Thanks and regards -- Vinay -- 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 -- William Stein Professor of Mathematics University of Washington http://wstein.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] import .sage file [was : Evaluating Symbolic Expressions]
On Wed, Nov 2, 2011 at 3:22 AM, Laurent moky.m...@gmail.com wrote: Hi, I think its a issue of parsing. If your file is called hello.py it gives the errors you mentioned. However if you call your file hello.sage it works. If you call your file hello.sage and run sage hello.sage it generates a hello.py which I append below - I know that, but I never understood how to use it because if my file is named hello.sage, I cannot do import hello.sage in an other file. But if it is named hello.py, I can write import hello I admit I never got trough the doc about that issue ;) .sage files are not meant to be used like normal Python modules. You can only load or attach them. I implemented this in 2005, when I was basically implementing something like Magma on top of Python. I'm not sure this is good or bad, but I definitely find sage: attach file.sage to be *useful* in practice. William Laurent -- 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 -- William Stein Professor of Mathematics University of Washington http://wstein.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] import .sage file [was : Evaluating Symbolic Expressions]
.sage files are not meant to be used like normal Python modules. You can only load or attach them. I implemented this in 2005, when I was basically implementing something like Magma on top of Python. I'm not sure this is good or bad, but I definitely find sage: attach file.sage to be *useful* in practice. Yep, attach is really usefull. However I've some big bunches of code using sage divided in several packages and I thus have to name them .py :) And then I have to use the difficult syntax. It's not really an issue, but when I began I has some difficulties to understand why some pieces of code was working in a context and nonworking in an other. Have a good afternoon, Laurent -- 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
