I have a first version of an implementation of free groups, finitely
presented groups and braid groups. For the moment there is a partial
list of the fatures:
-operation in free groups, finitely presented groups and braid groups
through gap.
-some gap functions are wrapped, such as abelian
I have been working on an implementation of braid groups for sage
(together with free and finitely presented groups). So far i have a
preliminary version (see ticket #12339). It is still not feature
complete and also very slow compared to cbraid[1], for example, but it
is usable.
In order to
Maybe i am saying something stupid (i am used to geometric reasoning
in infinite fields, so maybe i am missing something important in this
setting) but, wouldn't a random linear combination of the rows of your
matrix have a high probability of having all the entries different
from zero?
The
A slightly unrelated problem:
Would it be possible to include the findstat functionality in sage? That
is, i have a bunch of pairs (permutation, number), then call the function
findtsta on them, and get a list of possible ways that the numbers can me
computed from the permutations. All inside
Just to clarify, i wasn't thinking on sage sending a query to findstat, but
performing the search locally (i.e. having findstat software included in
Sage).
I don't know how findstat is implemented, so i don't know how wise that
aproach would be. Does findstat relly on a big database that is
I have tested your demo. It works fine in firefox, but i can't see the
cells in konqueror 3.5.10 (sage notebook doesn't look well in
konqueror, but most of the functionalities work).
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I have to do some computations in an exterior algebra, and i have seen
that it is not yet implemented in sage, but there is some work in that
direction. My question is: will this feature be implemented in sage
4.1.2? If so, how complete will it be?. If no, any idea about when it
will be?
I have
I got the right answer (counting different cores of the same processor
as different processors) in all the computers i have checked (with
different number of processors and different flavours of linux). All
of them are x86 or amd64 architecture. Still have to check how does it
work with atom
I got 2 as answer over my core2duo laptop (running over gentoo linux),
which is correct counting the two cores as two processors.
I also got 2 as answer over my atom n270 netbook (running over
ubuntu), which is a single core processor but with hyperthreading. For
multithread computation
I have written this function that transforms a singular ring into the
corresponding sage ring. As far as i can tell it works fine with
polynomial rings over the real, complex, rationals and finite fields,
and algebraic extensions of them. It doesn't consider the monomial
ordering though (i
This still doesn't work the right way for finite extension fields:
sage: k.a = GF(2^8)
sage: P.x,y = k[]
sage: P
Multivariate Polynomial Ring in x, y over Finite Field in a of size 2^8
sage: r = P._singular_()
sage: coerce_ring_from_singular(r)
Multivariate Polynomial Ring in x, y over
Ops, i sent a wrong version. Here is the last one, with added suport
for rings over transcendental extensions:
def coerce_ring_from_singular(r):
cha=str(r.charstr())
vars=str(r.varstr()).rsplit(',')
ch=cha.partition(',')[0]
if ch=='real':
fiel=RR
elif ch=='0':
Whle doing a program, i found a problem when trying to compute the
syzygy module of an ideal of polynomials over the complexes.
Here is the code tha showed the error:
R.x,y,z=PolynomialRing(CC)
config2=(x^2+8*y^2+21*x*y-x*z-8*y*z)*(x^2+5*y^2+13*x*y-
I agree that, when it is possible, it is better to work in exact
rings. But sometimes (not in this particular example, but in other
similar ones) you actually need to use complex numbers. I guess there
is a way to do it in an alggebraic extension of Q, but i am not sure
how to handle that with
On 25 nov, 15:54, Nathann Cohen nathann.co...@gmail.com wrote:
Hello !!
I have some invitations for Wave left... If you are interested, leave
your email here !
Nathann
I would like to try it. My email is mma...@unizar.es
Miguel Marco
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Ok, i have tried to compile sage for armel/fremantle, but run into an
error.
What i did is the following:
1)Run the maemo sdk virtual image on virtualbox (i didn't want to
install the sdk manually, so i opted for the easy option)
2)Unpack the sage source in a directory
3) Log in to scratchbox
What happens if you type this:
cd /home/maemo/workspace/sage-4.3.1
./sage -python
import sys, os
-- William
Nothing noticeable:
[sbox-FREMANTLE_ARMEL: ~/workspace/sage-4.3.1] ./sage -python
Python 2.6.4 (r264:75706, Jan 23 2010, 12:32:46)
[GCC 4.2.1] on linux2
Type help, copyright,
export SBOX_REDIRECT_IGNORE=/home/maemo/workspace/sage-4.3.1/local/
python
Tried that. Didn't work :(
Any more clues?
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Ok, i have gone with a new attepmt, compiling sage in the phone
itself.
What i did is to install the easy-deb-chroot package (it basically
mounts a disk image with a debian-arm system, and chroots into it).
Then i installed in that echroot environment the needed tools (build-
essential, m4 and
I have tried to cross-compile atlas inside scratchbox and it also
fails. Is it possible to compile sage without atlas?. I would rather
have a sage installation with some features missing, than having no
sage at all.
Cheers,
Miguel
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Could you post the error message from ATLAS. There have been a lot of problems
wtih ATLAS on Sage - specifically to those on Solaris, but workarounds have
been
found to all of them, even though there is no official new ATLAS release which
addresses these points.
It may be possible to fix
I'm compiling right now on my SheevaPlug (ARM, running Ubuntu 9.04).
The build fails on a number of packages: fortran, lapack, atlas,
linbox, blas, matplotlib, singular, and R. I'm trying the latest
version of numpy to see if I can get the build process to actually
finish.
I'm on a
If i try to do this:
var('x,y,z,a,b,c,d,t')
f=x^3-y^2
fr=real_part(f).subs({real(x):a,imag(x):b,real(y):c,imag(y):d})
fi=imag_part(f).subs({real(x):a,imag(x):b,real(y):c,imag(y):d})
sol=solve(x^2*t^2+y^2*t^2+t^2*z^2+(1-t)^2==1,t)[0]
sol=sol.rhs()
ffr=fr.subs({a:x*sol,b:y*sol,c:z*sol,d:1-sol})
I would need to deal with exterior algebras, and as far as i have
seen, they are not defined in sage. I could try working on
implementing them, but i have no idea how to build the corresponding
class in sage.
What should be the appropiate aproach? Is there some documentation
about how to build
Thanks for the code. From what i see, it does not inherit ideals or
groebner basis. I will try to take a look at that.
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Ok, i have seen how to define them in singular properly. Something
like this:
ring r=0,(x,y,z),lp;
def a=nc_algebra(-1,0);
setring a;
ideal i=x2,y2z2;
i=std(i);
qring e=i;
setring e;
creates an exterior algebra. The command Exterior() from the package
nctools.lib does essentially the same.
I
While preparing a linear algebra class with sage, i found that the
functions related to eigenvectors, eigenspaces and eigenvalues are not
function of the endomorphism objects (which would be the
mathematically correct deffinition), but of the matrix objects.
Wouldn't it make sense to add these
Implement it and post a patch.
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Professor of Mathematics
University of Washingtonhttp://wstein.org
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During the discusion about ticket 8974
https://webmail.unizar.es/horde/imp/login.php
i noted that the behaviour of eigenvectors, eigenspaces and
eigenvalues method of matrices is not mathematically correct. Or being
more precise, it does not translate directly into mathematically
correct methods
On 14 jun, 15:45, John Cremona john.crem...@gmail.com wrote:
I think that sounds a good idea; but can we call the parameter
extend and not base_extend? First, as that is less frightening
for users (who will need examples to show that for a real matrix, if
you want complex eigenvalues you
I am OK with keeping the default extend=True. But i would like it to
be the opposite in the case of endomorphisms (i know it is not a good
idea to have different default behaviours for matrices and
endomorphisms, so i won't argue if its decided to keep it alwais true
as default).
My reason to
Reading again this discusion i have noticed that eigenspaces behaviour
is not what i expected:
sage: M=matrix(QQ,[[1,2],[3,4]])
sage: M.eigenspaces()
[
(a0, Vector space of degree 2 and dimension 1 over Number Field in a0
with defining polynomial x^2 - 5*x - 2
User basis matrix:
[ 1
I have sent a patch to ticket 8974 that implements this feature.
http://trac.sagemath.org/sage_trac/ticket/8974
It is mixed with the implementation of this functions for
endomorphisms. I hope thats not a problem.
Miguel.
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To
I think the current design fits perfectly for a classroom server, but
maybe its true that the public notebook server gets too much garbage.
The rating system should be a solution for this, but clearly, doesn't
work. Maybe just a regular garbage collecting could be usefull. But
then again, we need
On 14 ago, 00:59, Dr. David Kirkby david.kir...@onetel.net wrote:
IMHO, if a user sets up a Sage server, he should have 20 or 30 decent examples
installed for him to look at. He may never chose to even make that server
public. But some decent examples would still be useful. I think there
Some time ago i tried to compile sage on a nokia n900 (it is arm
architecture, like most android devices), over a debian-arm chroot
inside the native maemo OS. the compilation process went on for
several hours, but it crashed eventually. IIRC, the problem i found
was with the atlas library, which
It is possible that i could get some funding to organize a workshop,
which must be related to aplied and computational algebraic topology.
I thought about organizing a sage days devoted to braids and/or knots
and links; maybe with sprints aimed at the implementation of free and
finitely presented
When is all this expected to be merged?
On 24 oct, 15:50, Burcin Erocal bur...@erocal.org wrote:
Hi Pablo,
On Mon, 24 Oct 2011 10:32:12 -0300
Pablo De Napoli pden...@gmail.com wrote:
Many thanks!
I see that with this patches, it would be esasy to have also a Weyl
algebra implementation
Thanks for the responses.
What i still don't know is how coding sprints are suposed to be. Do
they happen in the hotel or in the conference rooms? Are they planed
in advance or do they just happen spontaneously? Do they involve
everybody working together in one task or each one works in a
There are some computations for which there are several algorithms
available. Think, for example, of GTZ and SY algorithms for primary
decomposition. There is no useful criterion to determine which one
will be faster for a given case in advance. With modern computers
having multiple cores, i think
What i had in mind is something like this:
right now you can compute the primary decomposition of an ideal using
I.primary_decomposition(algorithm='sy') (default) or
I.primary_decomposition(algorithm='gtz')
what i propose is to keep this, and add some option like
Thanks for the example, Tom. I have tried to implement the
algorithm='parallel' in the primary decomposition, but it doesn't
recognize the parallel function. If i try to import it, it gives an
error message at startup.
I have tried with
import sage.parallel
from sage.parallel import all
But
or invalid
The error message is: ('EOF in multi-line statement', (80, 0))
---
ImportError Traceback (most recent call
last)
/home/mmarco/sage-4.7.2/local/lib/python2.6/site-packages/IPython/
ipmaker.pyc
So, the solution is to move the parallel importation to somewhere
else? Which would be the apropriate place?
On 5 nov, 14:28, Maarten Derickx m.derickx.stud...@gmail.com wrote:
The problem is that by putting
from sage.parallel.all import parallel
in
I have created a virtual machine with sage and a very minimal system.
In my machine (a core i7 desktop) it boots in less than 10 seconds,
and has a sage server running in around 20 from the pressing of the
start button.
It can be downloaded from
http://riemann.unizar.es/sagevm/Sage.ova
I don't
:
On Nov 9, 10:59 am, mmarco mma...@unizar.es wrote:
I have created a virtual machine with sage and a very minimal system.
In my machine (a core i7 desktop) it boots in less than 10 seconds,
and has a sage server running in around 20 from the pressing of the
start button.
It can
not sure if it would save a lot of space.
On 9 nov, 12:41, Jan Groenewald j...@aims.ac.za wrote:
Dear Marco,
On 9 November 2011 13:34, mmarco mma...@unizar.es wrote:
The .ova file is 2 gigs big.
What makes it this big? I would guess 500M minimal install, 500M Sage,
and the rest is desktop
...@gmail.com wrote:
On Nov 9, 1:00 pm, mmarco mma...@unizar.es wrote:
It is that big because just the sage directory itself is very big. The
guest OS is really very minimal: almost no services running, and only
installed the very basic stuff (no x server, for instance).
Maybe some space could
9, 2011 6:34:18 AM UTC-5, mmarco wrote:
The .ova file is 2 gigs big.
This is too big. I'm maintaining the official virtual image and its only
1.4 gb, despite being a fairly standard Fedora install. Did you zero out
the virtual disk before exporting? There is trash in the unused virtual
BTW, i use a flexible virtual disk. Would that benefit from the
zeroing out?
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Yes, you need it. It is done with VirtualBox. I don't have VMWare
installed, so i am not sure, but i guess you can import it.
On 9 nov, 21:37, kcrisman kcris...@gmail.com wrote:
On Nov 9, 3:29 pm, mmarco mma...@unizar.es wrote:
Ok, after finding some files and directories that can be erased
In the download page of VirtualBox, there is a GPL binary for windows.
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Ok, the striped down 1.2 GB virtual machine is available in the same
link. Maybe some unneeded system utilities could still be removed, but
i wouldn't expect more than a few dozen MB gained from that.
I have noticed that, when running under virtualbox and closing saving
the state, everything
I forgot to mention that buiding sage from source writes the logs of
all the building process. Removing them saves a lot of disk space. I
think such a thing should also be included in the make micro_release
script.
On 10 nov, 12:35, mmarco mma...@unizar.es wrote:
Ok, the striped down 1.2 GB
I also use sage-on-gentoo. I find it a very good way to just use sage.
But i don't only use sage, i also develop it: when there is a feature
i miss, i implement it (if i have the knowledge and time to do so).
The easyest way to do so is to have sage installed in a directory in
the standard way.
So, summarizing, a (let's say) VirtualBox VM, that boots directly into
simple X environment with sage running on the background+firefox open
pointing at it would be a good solution?
That seems feasible. The bigest problem i see is the mouse
integration.
What about a VM with no X that just boots,
Then its even better that i thought. I always tried VirtualBox without
the extensions, so the mouse integration is a problem.
On 9 ene, 21:30, Volker Braun vbraun.n...@gmail.com wrote:
On Monday, January 9, 2012 3:25:54 PM UTC-5, mmarco wrote:
That seems feasible. The bigest problem i see
By the way, how canhttp://localhost:8000ever work? If I'm using
VirtualBox and I go tohttp://localhost:8000in Internet Explorer, I'm
definitely *not* going to get something having anything to do with the
virtual machine.
You can configure port forwarding with VirtualBox. If you forward
Is there another port that is usually not firewalled that could be
used?
On 9 ene, 22:28, Volker Braun vbraun.n...@gmail.com wrote:
On Monday, January 9, 2012 4:19:36 PM UTC-5, mmarco wrote:
You can configure port forwarding with VirtualBox. If you forward port
8000 of the host system
I don't think the case of users who would use the secure=True option
but are not that sophisticated is as unusual as William assumes. I
know several examples (and i am one of them). I would agree with the
elimination of this option IF the way to recompile it with openssl
support is adequately
I have no contact with windows systems at all, so i don't know how is
the real situation right now.
Is it usual that windows systems come with port 8000 firewalled? How
hard would it be for an average user to open that port?
And also, does the port forwarding method work even if there is no
Oh, and by the way: what about the option of running the VM in
headless mode? That would definitely solve the problem of the cursor
stuck that William pointed. And would make easyer to do a simple one
click launch script.
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Again, that is what my current virtual machine does. It works fine as long
as the host has networking up and running.
So port forwarding in windows does not work if the host system does
not have a network connection? That really complicates things.
That would leave the aproach of shipping a
Ok, so the main problem with your VM would be the firewalls and
antivirus?
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What i meant by headless is to run it completelly in the background,
with no window showing at all. You can run a VM in that way with the
VBoxHeadless command.
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One other thing that would make this massively better. It would be
cool to modify the notebook somehow so that it could store all the
worksheets on the host Windows filesystem instead of inside the VM.
Right now, when people delete the VM and install a new one, all of
their worksheets
Well, (very quick and dirty) hack would be to make the GUI app to
sync (through ssh, for example) some folder in the host to the /
home/.sage directory at startup, and then sync back periodically.
Other option would be to let the GUI app manage the shared folders
configuration (again, by
There is another consideration to be taken into account: if we
distribute a VM with the virtualbox guest additions installed, we can
distribute it... but i am not sure under which license. It could be
that the user should accept the VirtualBox PUEL license, and, for
example, it is not clear if the
This really looks like a great out-of-the-box solution. But it takes
around a minute and a half since i start the VM till i get the working
notebook. Can this startup time be improved?
On 10 ene, 22:42, Volker Braun vbraun.n...@gmail.com wrote:
Here is a new version of the virtual machine that
I have tried the new VM from Volker (on a linux host), and the guest
browser works fine, but i can't connect from a host browser. Somebody
else noticed this?
As for the shared folders, i think it would be a good idea to include
a dialog in Emil's installer to configure them after the .ova image
The port forwarding seems to be well configured in Volker's VM (the
same configuration works fine in otyher VM's), but i don't know why it
does not work. Maybe something isn't right in the guest system?
Volker, are you sure that your guets system is listening to ssh
connections, and that it
Volker, can you access the sage notebook from the host using your last
VM? I can't.
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In fact, i get that only the lo interface is up in the guest system. I
think that explains the problem.
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On 12 ene, 16:38, Volker Braun vbraun.n...@gmail.com wrote:
password is always sage
I've configured the window manager to the bare minimum. Ideally we'd run
without a wm but that seems to break VirtualBox seamless mode. We should
also disable moving and minimizing the browser window inside
Working in my own VM, i have noticed a problem of the browser inside
the VM aproach: keyboard layout. Is there a way to make VirtualBox
use the host layout inside the guest?
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Is there any hope of compiling sage for android? or the only way to
have sage running on a tablet would be to install a linux system on
top of the android one?
On 17 dic 2011, 16:34, Julien Puydt julien.pu...@laposte.net wrote:
Le 04/12/2011 20:09, Julien Puydt a �crit :
I have successfully
I am trying to implement free groups, finitely presented groups and
braid groups in sage. So far i have writen a proof of concept for the
free groups (see ticket 12339), but i don't have any experience with
the category and coercion frameworks.
Any feedback and/or colaboration would be most
My idea was to use cbraid behind the scenes to implement braid groups.
http://code.google.com/p/cbraid/
On 23 ene, 12:58, Dima Pasechnik dimp...@gmail.com wrote:
Given that Chevie needs Maple, it can be regarded as highly optional.
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I have been working on a VM with compressed filesystems. I have
thought that maybe a good aproach to the automatic generation
problem would be to mount the sage directory from a compressed file in
a shared folder. It should need, as William sugested, a windows GUI
app that would take care of
A more technical detail - I am curious:
How to you allow persistant changes to the sage directory in the
compressed filesystem? Do you plan to use an overlayed filesystem with
a persistant savefile? Or do you have the sage directories just as
read only?
cheers
I use unionfs to mix the
On 5 feb, 09:30, Volker Braun vbraun.n...@gmail.com wrote:
I think thats all premature optimization. First we need a bulletproof way
of running Sage in the VM. At the end we can still worry about ways to
shave off another megabyte or two. Most VM questions I got were about how
to add more
I have little experience with pyqt, and i am not sure that would be
the way to go. A windows user that would want to use a pyqt program
would need to have installed in his system: python, pyqt and qt. The
offline windows installer of qt is 1.3 gigs. That's overkill for a
simple gui app. There must
Continuing nontrivial Geogebra integration could
be another very appropriate one.
- kcrisman
Big +1 to that.
* webwork/sage integration
I would also add integration with moodle (maybe that would include
ldap?)
There is also some mathematical stuff that i would like to see in
Sage, but
I have added a new version, with an implementation of finitely
presented groups.
It can be improved for sure: lots of gap functions can be wrapped, and
maybe the implementation is not optimal; but it works. It passes all
the test suite except the pickling tests. Any clue about how to solve
it?
The gap session to which sage communicates is started by default with
the option -o G set. This means that, if gap uses all the memory
it won't return an error message, but will be killed by the OS. The
sage session continues, with an error message, but there would be
orphan objects that point
Take a look at this:
http://www.molto-project.eu/node/1412
It is a library that can translate natural language sentences to sage
commands. I haven't tested it, but the examples they show sound
impressive:
sage compute the product of the octal number 12 and the binary number
100.
(3) 40
answer:
What is the issue with haskell? Its license?
On Feb 29, 6:33 pm, William Stein wst...@gmail.com wrote:
On Wed, Feb 29, 2012 at 3:55 AM, mmarco mma...@unizar.es wrote:
Take a look at this:
http://www.molto-project.eu/node/1412
It is a library that can translate natural language sentences
So, returning to the original subject. Would it be ok to have this
natural language interface, say, as an optional package? Or as someone
suggested, to have it in some experimental server?
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I tried to answer to the post of the arm port, but i am not sure why i
can't.
I am considering buying an asus eeepad transformer prime. So i would
like to compile sage on it. What are the changes that need to be done
to the source code to do it?. Is there somewhere a tarball with the
code
Does that run android or a complete distribution?
It does run android, but i have read that it is possible to install
ubuntu in a chroot environment.
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Ok, i finally got the tablet, installed ubuntu in a chroot, and tried
to compile sage. The build process went on pretty far,but eclib keeps
failing. I get the following error message:
Assembler messages:
Fatal error: can't create egr_n.o: Input/output error
Any clue about how to solve this?
And
No, sorry. Perhaps this is where you happen to run out of memory?
It's possible. I think i hit into a memory problem with symmetrica,
but solved it enabling a 512mb swap file. Maybe it wasn't enough for
eclib.
I have a new autotools-based release of eclib, which will be turned
into a new
Could you tell is the specifications of your tablet?
It's an asus transformer prime. The processor is an nvidia tegra 3.
bash-4.0# more /proc/cpuinfo
Processor : ARMv7 Processor rev 9 (v7l)
processor : 0
BogoMIPS: 1993.93
processor : 1
BogoMIPS: 1993.93
Ok, i have tried to enable 2 gigs of swap space, and it keeps
failing with the same error message, although it takes much more time
to crash (from 8 minutes without swap to more than two hours with the
2 gigs). It really sounds like a memory problem, but i am not sure
that more swap would solve
its version 4.8, with flint 1.5.2
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and my chroot environment is ubuntu 9.11 armel.
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I can install a newer ubuntu system in a chroot. I think that the fact
of running under a chroot environment shouldn't prevent the sage build
from running. All the libraries are in the chroot jail.
So if you have an armel build, i can give it a try.
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Well, it's only a 4.8 after all : I only had one 5.0beta?? tree left,
and it was in a dubious state. 4.8 is the last which should work (even
though I didn't use it since long :-/)
I ran ./sage -bdist 4.8, then removed the obtained .tar.gz, then
re-made a .tar.bz2 (and it's still big...).
I have finally downloaded the file, and it doesn't run on my tablet.
It seems that it was compiled in a different setup. I have changed to
a newer version of ubuntu, and will try to compile from source. John,
is your new version of eclib available as an spkg?
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of
the generators, it fails:
sage: G=FreeGroup(('a','b','c'))
sage: G.inject_variables()
Defining a, b, c
sage: G.hom([b,b,b])
---
TypeError Traceback (most recent call
last)
/home/mmarco/sage
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