ion of
positivity, checking if something is > 0 feels like the right duck-typing
thing to do. I guess I'll try some other way.
On Saturday, June 27, 2020 at 12:40:54 AM UTC-10, Dima Pasechnik wrote:
>
> On Sat, Jun 27, 2020 at 10:38 AM Rob H. >
> wrote:
> >
> >
&
Hi all,
So I was surprised to find out that asking if a polynomial is > 0 doesn't
raise an error. Now, maybe there's a good reason why it returns True and
I'm too tired to think about why. At the very least, here is some
disturbing behaviour.
sage: R. = PolynomialRing(QQ)
sage: x > x-1
True
ted module 'gmpy2'
[sagelib-8.4] sage/rings/real_double.pyx: cannot find cimported module
'gmpy2'
[sagelib-8.4] sage/rings/real_mpfr.pyx: cannot find cimported module 'gmpy2'
Sage starts find after the doc build completed, but I was wondering about
that error.
Thanks.--Rob
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I'm using a Ubuntu 18.04.1 LTS, currently with Xfce4, but also Lxde, on a
Dell G7 with i7-8750H cpu and 16 gb of ram, and I built Sage version 8.3
from source.
The text I'm working from say that I should get this result:
sage: p.collect(x).collect(y)
sage: 2*b*y*x^2 +
Hi.
I'm using this polynomial:
p = z*x^2 + x^2 − (x^2 + y^2 )*(a*x − 2*b*y) + z*y^2 + y^2
and when I issue this command:
p.collect(x).collect(y)
to Sage 8.3 in the terminal, I get this response:
-a*x^3 + 2*b*x^2*y + 2*b*y^3 - (a*x - z - 1)*y^2 + x^2*z + x^2
Notice that only y is collected.
My computer must be cursed today. Now the upgrade to cddlib hangs with a
very strange error message:
configure: error: ls -t appears to fail. Make sure there is not a broken
alias in your environment
configure: error: newly created file is older than distributed files!
Check your system clock
Hi,
Mac OS 10.13.4. Upgrade from 8.1 to 8.2. Hangs at
[ncurses-6.0.p0] config.status: creating include/ncurses_cfg.h
This happened when I used "sage --upgrade" and it occurs again with "sage
-i ncurses".
I will try to build from scratch and see if that works any better.
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I need to package all the test site applications into one massive PDF, a mildly
tedious affair.
This cannot be an appendix, but should go in "Supplemental Material". But it
should not look like effusive "letters of support." The AMATYC material follows
the guidelines perfectly - just a
a) can't handle? Is there some
trick I can use without manually assuming each such case that arises?
Thanks,
Rob
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k, it's completely separate. @interact is only
> available for Sage itself. (Cc:ing Rob B in case he has an idea for how
> this could fit into MBX.)
>
It would be a nice fit for MathBook XML, but you need to place the
"shiny-app" on a server, which you set up yourself (o
(with a clean boot
of sage to begin with) might make sense, but I just don't know. Is there a
standard way to do such a benchmark? The code we are using is written as
new modules and so is fully incorporated in the copy of sage we are running
(in case that matters).
Thanks,
Rob
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Hi,
I tried logging in to trac and my credentials were refused. Acknowledging
it was possible that I changed my password a while back and forgot, I reset
my password. The password sent to me by email also doesn't work. Is the
login system down?
Thanks,
Rob
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Dear Nils,
Thanks for the careful explanation. There's a good reason I don't teach
this stuff (even if I enjoy it!).
Rob
On Thursday, November 5, 2015 at 7:35:47 PM UTC-8, Nils Bruin wrote:
>
> On Thursday, November 5, 2015 at 5:11:42 PM UTC-8, Rob Beezer wrote:
>>
>> LIke
> residue there is surely undefined ?
> On Nov 5, 2015 3:53 AM, "Rob Beezer" <goo...@beezer.cotse.net
> > wrote:
>
>>
>>
>> On Wednesday, November 4, 2015 at 7:37:58 PM UTC-8, vdelecroix wrote:
>>>
>>> z/2 vs 2/z
>>>
>>
>
should be 2?
Thanks,
Rob
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On Wednesday, November 4, 2015 at 7:37:58 PM UTC-8, vdelecroix wrote:
>
> z/2 vs 2/z
>
Ouch! Sorry. Wrong input, same output.
z = var('z')
f = e^(2/z)
f.residue(z)
Result: 0
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it!
Apologies for wasting people's time,
Regards, Rob.
edit flag offensive delete link more
add a comment
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Hi, I am using the Sage app on my iPad and I would like to reuse some maxima
scripts.
When I try:
default_mode(maxima)
fpprec
ss: 44
ss-2
I get:
File ipython-input-1-156fa75fa7d5, line 4
ss: Integer(44)
^
SyntaxError: invalid syntax
Can anyone help?
Regards, Rob.
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On 17/05/2012 20:41, David Kirkby wrote:
On 17 May 2012 16:57, Rob McMahonrobmcmaho...@gmail.com wrote:
Answering my own question: it's this line from
spkg/build/prereq-1.0/configure{,.ac}
if test x`file $SAGE_FORTRAN_LIB | grep 32-bit | grep \dynamic lib\ `
= 'x'
Having set my path up
First attempt to compile sage-5.0 on Solaris 10:
uname -a
SunOS mimosa 5.10 Generic_141444-09 sun4v sparc SUNW,SPARC-Enterprise-T5220
Solaris
Failed at the first post with:
checking for /usr/local/gnu/lib/libgfortran.so... yes
configure: The environment variable
configure:
On 17/05/2012 16:26, Rob McMahon wrote:
First attempt to compile sage-5.0 on Solaris 10:
uname -a
SunOS mimosa 5.10 Generic_141444-09 sun4v sparc SUNW,SPARC-Enterprise-T5220
Solaris
Failed at the first post with:
checking for /usr/local/gnu/lib/libgfortran.so... yes
configure
Thanks, David. I'll watch those tickets. -Rob
On Sunday, April 8, 2012 1:16:52 AM UTC-7, David Loeffler wrote:
There have been at least two attempts to implement this; see #8335, and
more recently, #11938. Sadly both of these are needs work. It would be
great if someone could finish
be appreciated.
Thanks,
Rob
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Is this better?
sage: [var('b'+str(i), latex_name=\\beta_+str(i),domain='real') for
i in range(4)]
[b0, b1, b2, b3]
sage: latex(b3)
\beta_3
Rob
On Feb 25, 2:08 am, Rolandb roland.vandenbr...@gmail.com wrote:
Hi,
Is a more compact declaration possible / supported?
var('b0',latex_name
Can you replace
L.level_sets()[-3:-2][0]
by
L.level_sets()[-3] ?
On Feb 25, 7:05 pm, Ryan Davis ryan.stance.da...@gmail.com wrote:
L.level_sets()[-3:-2][0][i].element.property() is the only way I've
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On Feb 21, 12:36 am, emil emil.widm...@gmail.com wrote:
Hi Rob, you understand more than I do - is this a bug (big step of
time needed for that type of calculation at an rather arbitrary
number)? Should I create a track ticket for that? Do you have also an
opinion on the various other points
, total: 89.93 s
Rob
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and
http://mailman.archlinux.org/pipermail/aur-general/2012-February/017571.html
Will these issues ever be addressed? I'd love to keep learning and using
sage, but don't want to abandon my current flavor of Linux.
Thanks,
Rob
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I have updated the Linear Algebra Quick Reference card to more closely match
version 4.8 and to catch up on 2.5 years worth of changes. You can find it (and
others) at:
http://wiki.sagemath.org/quickref
Rob
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, and developing a dot-com approach to maintenance, hosting,
notebook development, etc is a good way to go now.
Rob
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I sort-of fixed it by changing the LATEX_HEADER string in latex.py to
read '\textwidth 999in' instead of '\textwidth 6.45in' and then doing
a 'sage -b'.
I still don't know how to get jsmath to work properly, but it's not as
important now.
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I'm trying to display a large latex expression, but both methods that I know
of to do that (html() and latex.eval()) wind up cutting parts off when it's
actually displayed. (The exact latex string I've used to generate these
pictures is here: http://pastebin.com/sbK8EqdR )
I'm using sage 4.6
On Aug 7, 1:41 pm, Jacob Schlather jacob.schlat...@gmail.com wrote:
Sure
processor : 0
vendor_id : GenuineIntel
Thanks, Jacob. I'll point the other bug report back here.
Rob
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a segfault (very predictably), and building from source solved
the problem. I wonder if the two reports are related?
http://trac.sagemath.org/sage_trac/ticket/11581
Rob
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sage
quite
fast.
Rob
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(RDF, 400, 400, lambda i,j: i+j)
sage: time x = M.LU()
Time: CPU 0.02 s, Wall: 0.02 s
Rob
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On Apr 6, 8:39 pm, John Cremona john.crem...@gmail.com wrote:
where A^* is the conjugate transpose.
You mean the adjoint of a matrix, right? ;-)
I hijacked this topic and regenerated it over on sage-devel - should
have posted a link earlier:
, and put it on
my list - though I won't get to it immediately, so it is fair game for
anybody else who may be interested.
http://trac.sagemath.org/sage_trac/ticket/11145
Rob
On Apr 4, 2:31 pm, Edgar Duenez-Guzman eadue...@gmail.com wrote:
I have been struggling with symbolic computation
Here's another simple example of basic simplifications that aren't
processed:
P.x=SR[]
F=P.fraction_field()
print F(x/x)
print simplify(F(x/x))
Output:
x/x
x/x
Does anyone have any suggestions on how to fix/circumvent these
problems?
Thanks,
+Rob
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'. I just want to be able to simplify the expression so that I
can 'view' it. (In reality I have a 16x16 matrix of expressions more
complicated than this one, and I'd like to be able to 'view' them in
their simplified form).
Thank you very much,
+Rob
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quadratic form over
some ring R and I'd like to be able to do this whenever R is contained
in a ring where 2 is invertible.
Thanks,
+Rob
P.S.: As an aside, I was able to take the fraction_field of (Z/10Z)[x]/
(x^2), but not of Z/10Z itself. Perhaps this is because the method
is_integral_domain
On Thursday 10 June 2010 21:59, Jan Groenewald wrote:
After editing the Makefile to fix that problem, make issues the same error on
another file, then another and another. After editing the Makefile about half
a dozen times, I just gave up. I tried to contact the author but apparently
the
alternative is my package, PyDSTool, if you
are keen to work with similar tools to XPP in a more programming-style
environment.
Good luck,
Rob
On Jun 10, 5:01 pm, Jose Guzman n...@neurohost.org wrote:
Dear Sage users,
I am going to take a course on computational neuroscience soon. Tutors
Yes, there were changes, including the output format, as of 4.4 (about
7 weeks ago).
See eigenmatrix_right totally broken at
http://trac.sagemath.org/sage_trac/ticket/4756
Rob
On Jun 6, 7:27 am, Mike Witt msg...@gmail.com wrote:
Has something changed recently. I'm running v.4.3.5
[m
The Sage notebook uses jsMath to render mathematics. jsMath only
implements a (large) subset of TeX, so it is likely that \cancel is
not part of its capabilities. You can see much of what is possible
at:
http://www.math.union.edu/~dpvc/jsMath/symbols/welcome.html
Rob
On Jun 6, 4:31 am, dbjohn
guidance. ;-) that was my thought anyway.
(3) For any object in Sage (ie built as a class) define the _latex_()
method to return a latex representation (string of latex commands to
place inside dollar signs), then everything else is free.
Rob
On Jun 6, 12:15 pm, Mike Witt msg...@gmail.com wrote
at a system prompt, it couldn't be much easier.
Rob
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vector, as expected if the items are really an eigenvalue and
right eigenvector of M.
Rob
On Jun 5, 7:03 pm, Mike Witt msg...@gmail.com wrote:
I'm confused about this, and hoping for some clarification ...
sage: M=matrix([[0, .707-.707*i],[.707+.707*i, 0]])
sage: M = M.change_ring(CDF)
sage
: latex.engine('pdflatex')
sage: view(x^5, tightpage=True)
Rob
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where the old versions didn't seem to
work (or build, anyway).
Thanks again!
Rob
On Apr 19, 8:04 pm, William Stein wst...@gmail.com wrote:
I have now posted a brand new VMWare Sage-4.4 image:
http://boxen.math.washington.edu/home/wstein/binaries/sage-vmware-4.4...
It's something I made from
to it.
But maybe I'm asking for too much. Again. I have an S_4 example to
fall back on, which seems to finish in reasonable time, though doesn't
have the non-solvable flavor I am after.
Thanks,
Rob
sage: M.a=NumberField(x^5-x-1)
sage: y=polygen(M)
sage: (y^5-y-1).factor()
(x - a) * (x^4 + a*x^3
and assume it is correct when
there is no error.
Thanks!
Rob
On Apr 14, 8:06 pm, Alec Mihailovs alec.mihail...@gmail.com wrote:
On Apr 14, 2:08 pm, Rob Beezer goo...@beezer.cotse.net wrote:
Rinse, repeat. First iteration is below. By the time I get to degree
3 the factorizations are taking
I've officially given up on ever getting VirtualBox to work properly
on my netbook (I'm pretty sure it's just a memory issue), so I'd like
to go back to the last VMware version (4.1.2, I guess).
I can find where to find the source code for the old versions, but
I've looked all over sagemath.org
, April 3, 2010, Rob furit...@gmail.com wrote:
I've officially given up on ever getting VirtualBox to work properly
on my netbook (I'm pretty sure it's just a memory issue), so I'd like
to go back to the last VMware version (4.1.2, I guess).
I can find where to find the source code for the old
On Jul 22, 10:35 pm, Rob Beezer goo...@beezer.cotse.net wrote:
A student of mine was running a connection to a Sage notebook server
on his Android phone last Friday. He showed me an interesting plot,
so I know it was working properly. I'll point him to this discussion
and see if I can get
A student of mine was running a connection to a Sage notebook server
on his Android phone last Friday. He showed me an interesting plot,
so I know it was working properly. I'll point him to this discussion
and see if I can get details.
Rob
Dan Christensen wrote:
Oh, if anyone *has* had
complaining.
Sample code below may help with understanding/debugging this
situation. This is now
http://trac.sagemath.org/sage_trac/ticket/6516
Rob
~~
sage: latex.extra_preamble()
''
sage: g=graphs.PetersenGraph()
sage: latex.extra_preamble()
'\\usepackage{tkz-graph}\\usepackage{tkz-berge
Jens,
Does the following Sage command-line session begin to do what you
want?
Various parts could be more streamlined and/or automated for a larger
matrix.
Rob
sage: for i in range(4):
: var(a+str(i))
:
a0
a1
a2
a3
sage: J = matrix(2,2,[a0,a1,a2,a3])
sage: J
[a0 a1]
[a2 a3]
sage
defining a function and
without thinking about 0-based indices.
Rob
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this all gets reorganized in the next overhaul of the
notebook.
Rob
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}
sage: nb.save()
Use the script at #5880 to clean out massive numbers of saved
worksheets. Apply the patch to reduce the actions that lead to a
worksheet saves.
Apply #5895 if you want to permanently cap snapshots to 30 per
worksheet, with amnesty for worksheets created before May 1, 2009.
Rob
I have made a patch that attempts to limit the number of snapshots
that get saved (per worksheet) to an absolute maximum of 30. There's
a bit of a dilemma about just how to do this, given that at present
some users will have more than 30 snapshots for some worksheets, and
in the future this
, but will let this thread run
its course first.
Rob
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Jason,
Have a look at:
http://trac.sagemath.org/sage_trac/ticket/5371
http://trac.sagemath.org/sage_trac/ticket/5459
There are few other tickets about that are relevant, as well.
Rob
On Apr 21, 7:46 pm, Jason Grout jason-s...@creativetrax.com wrote:
I was just troubleshooting why my sage
to help isn't sufficient to remind me
enough to give an accurate answer. :-(
Rob
On Apr 22, 10:13 am, kcrisman kcris...@gmail.com wrote:
Followup:
The original patch athttp://trac.sagemath.org/sage_trac/ticket/5371
has some comments in it about extending the default save times if you
wnt
. Unfortunately, I am not that person, but I'd be ready to
help and review work done in this direction. Done right, this might
obsolete several other patches and then free up others that would also
be welcome enhancements to the notebook.
Down off soap box,
Rob
2009 in the filenames
This Ubuntu thread, suitably updated to newer filenames, shows how to
install the 64-bit plugin for Java.
http://ubuntuforums.org/showthread.php?t=1011899
But you may need to also disabuse Firefox/Ubuntu of the other plugiuns
you have about.
Rob
to some 64-bit specific
information.
I have JMOL working just fine in Firefox on KUbuntu 8.10, though on
Intel (which I think shouldn't matter much).
Rob
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HTML with file:// and localhost:8000// type URLs,
to various locations (near worksheets, or elsewhere), but with no
luck.
Rob
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On Apr 9, 9:53 pm, William Stein wst...@gmail.com wrote:
If you do Data -- Upload File, then upload the file foo.png,
you can use img src=foo.png
Thanks, William. That does the trick.
So after uploading an image, you can just use the TinyMCE image-insert
tool, where all you need to do is put
The thread linked to below begins the same way. Maybe it has the
answer you need.
http://groups.google.com/group/sage-support/browse_thread/thread/6fc59581c9ed1af1
On Mar 21, 8:14 am, nerak99 t10...@gmail.com wrote:
Having played with Sage on a desktop PC I wanted to set it up as a
school
away politely and I can edit some more.
Rob
On Mar 21, 9:55 am, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hello, this is related to the thread
athttp://groups.google.cz/group/sage-support/browse_thread/thread/2a699...
I think that installation
ofhttp://trac.sagemath.org/sage_trac/attachment
. Not
sure what you are up to exactly, but with determinants and
polynomials, perhaps the scaling has a predictable effect. I like the
looks of Mike's suggestion very much, and if this helps you get there,
then I think thousands of 30x30's are achievable.
Rob
On Mar 19, 9:29 pm, Rob Beezer goo
for the two permutations as far as the
length of the first.
John's patch at Trac 5537 should correct this. I'll have some timings
and a review up later today.
Rob
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for
the build to finish before you can use it).
Download sage-3.4.tar.
I place my installations under /opt. As root do the following:
1. cd /opt
2. tar -xvf sage-3.4.tar
3. cd sage-3.4
4. make
Wait patiently. ;-) Then ./sage or ./sage -notebook to run.
Rob
OK, I have a better, but still imperfect, idea of what is happening.
Discussion below is now at
http://trac.sagemath.org/sage_trac/ticket/5459
(I'm cross-posting the contnuation of this thread from sage-support to
sage-devel).
There is a notebook configuration item indexed by 'save_interval'.
that prevails. Consider
sage: nb = load('/home/rob/.sage/sage_notebook/nb.sobj',
compress=False)
sage: nb.user(rob-test)['autosave_interval']
3600
sage: nb.user(fcla)['autosave_interval']
180
sage: nb.user(admin)['autosave_interval']
540
sage: nb.conf()['save_interval']
60
With this configuration
minutes. The instructions might help others on different platforms -
the Sun download area has RPM's, etc.
Here is the Ubuntu thread, just follow the first poster's instructions
modified/adjusted to fit your situation.
http://ubuntuforums.org/showthread.php?t=1011899
Rob
On Mar 7, 6:57 am, John
I'd forgotten that about:plugins is so useful.
Do you know the Debian/Ubuntu alternatives scheme? Its a way to
specify a system-wide default editor, etc. See man update-
alternatives
On Ubuntu Hardy 8.04 I had to use (as root)
update-alternatives --config xulrunner-1.9-javaplugin.so
You
from Sun.
Rob
On Mar 7, 2:22 pm, John Cremona john.crem...@gmail.com wrote:
Thanks for the detailed instructions. I have never heard of
xulrunner. Something of that name was installed but I installed a
newer (?) version using synaptic. I also used update-alternatives to
get java to point
and they are *really* enhancing my
course. They should all migrate to the Interact/Calculus section of
the wiki when we get a chance.
But Java is a pain to get working. Right up there with the Flash
plugin. Its always the proprietary bits. ;-)
Rob
Simon,
For further advice on setting up to test new code, take a look at
http://tinyurl.com/d92o3v
Rob
On Mar 7, 12:10 am, Simon King k...@mathematik.uni-jena.de wrote:
Hi!
I would like to create an extension class that inherits from
CommutativeRingElement. In order to learn how it works
is on a portable, external USB drive I pack around,
so maybe that could have something to do with it. I think all these
files (or writes) are also impacting my performance (intolerable waits
on simple operations). fstab for this device says
LABEL=INOI-60GB-EXT /home/rob ext3 rw,relatime,noauto 0 0
Am I
/user_conf.py
which all have a 3 minute interval specifies. I edited all of them to
be 3600 seconds.
But I'm still getting saves about every 30 seconds after restarting
Sage.
Rob
On Mar 6, 8:05 pm, Marshall Hampton hampto...@gmail.com wrote:
Yes, running 3.3 should fix that. You can safely delete
My 30 MB nb.sobj was also being saved twice a minute. Is this a
reasonable size for this file?
After some head-scratching, I found the thread
http://tinyurl.com/aht325
which had the following commands to use at the sage command line:
sage: nb = load('/home/rob/.sage/sage_notebook/
nb.sobj
read then. I'll run some experiments tomorrow and report here.
Are others on some version of 3.4.rc0 seeing snapshots (and .sage/
sage_notebook/backups/nb.sobj updates) at 3-minute intervals? Or
something different?
Thanks for the help.
Rob
On Mar 6, 11:41 pm, mabshoff michael.absh
/sage-devel
explaining the problem and send the relevant part of
of /home/rob/sage-3.2.3/install.log. Describe your computer,
operating system, etc.
If you want to try to fix the problem, yourself *don't* just cd to
/home/rob/sage-3.2.3/spkg/build/clisp-2.46.p7 and type 'make'.
Instead type /home/rob
Thank you for the quick response. I guess I could just wait it out
then until the newer version comes out if there isn't a fix.
Here is the appropriate log: http://depositfiles.com/en/files/oo8wrvp5s
Thanks again,
Rob
On Jan 24, 11:53 am, mabshoff michael.absh...@mathematik.uni-
dortmund.de
Thanks for the response and for submitting this as a bug. I should
have thought to try a simpler test case.
Rob
On Oct 13, 4:58 am, Marshall Hampton [EMAIL PROTECTED] wrote:
This is now Ticket #4273 on trac (http://trac.sagemath.org/sage_trac/
ticket/4273).
I will try to fix this if no one
- the error seems more severe without setting
base_ring=QQ. I've also include a legitimate transformation matrix I
worked up by hand (with some help from SAGE!).
Is this expected behavior? Any usage hints or workarounds? Thanks.
Rob
m=matrix(QQ, [[2,0,1,1,0,0],[0,2,1,1,0,0],[2,0,1,0,0,1
A homework exercise for my students asks them to find all subgroups of
S_4, which should be a very instructive exercise, even if a bit
unreasonable. In SAGE, the conjugacy_classes_subgroups() method
gets you started, and the quick-and-dirty brute-force code below
creates all possible subgroups
a PermutationGroup), but maybe I'm missing something.
All the same, speeding things up with a use of the normalizer would be
just the sort of thing my students could appreciate a few weeks from
now.
Thanks again,
Rob
On Sep 24, 12:33 pm, John Cremona [EMAIL PROTECTED] wrote:
In Rob's example it would be nice
flexibility in naming and locating work sheets would be necessary.
So I thought I'd toss out this scenario as a similar situation where
some extensions to the worksheet file name and location structure
could make new uses of SAGE possible.
Thanks,
Rob
On Sep 24, 9:32 am, William Stein [EMAIL PROTECTED
individually) and the errors go away. Any
thoughts on how to make this work?
Thanks,
Rob
Code:
tetra=AlternatingGroup(4)
stab1=PermutationGroup_subgroup(tetra, [(1,2,3)])
stab4=PermutationGroup_subgroup(tetra, [(2,3,4)])
for g in stab1:
for h in stab4:
print g*h
Errors:
Traceback (most
Thanks, William. Just in time for class this morning. ;-)
Rob
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