> I presume your polynomial entries are mostly constants, otherwise
> you'd get a really huge polynomial as an answer. Do you know if your
> matrix has many rows/columns with just one non-0? This could be a good
> heuristic to do for sparse determinants, get rid of these first of
> all...
all the
>Can Sage do this determinant on its own?
Sage tries to convert the matrix to a dense one before computing the
determinant (the documentation for sparse matrices says so). And as a
result, you never see the end of it, no.
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would be a very useful addition (for some people). Magma constructs
> sparse matrices using SparseMatrix() with several interfaces including
>
> (m::RngIntElt, n::RngIntElt, Q::SeqEnum[Tup]) -> MtrxSprs
>
> The m by n sparse matrix, whose entries are given by the tuples in
&
Thanks! I think to know where the issue is :
M= random_matrix(ZZ, 10, sparse= True, density= 0.1)
M._magma_init_(magma)
Why should it be so hard to enter it into Magma?
is there any workaround that is worth trying? I could somehow directly
write magma code into a file, and then hope that loading that would be
faster, but I'm not sure why i would do better than the existing magma
interface...
thanks!
Pierr
I tried to follow the instructions, in a brand new cocalc project. This
failed, with
$ URL='https://gforge.inria.fr/frs/download.php/file/37020/'
$ DIRNAME='2017-08-22-15-45-31_GUDHI_2.0.1-rc1'
$ TARBALL=$DIRNAME'.tar.gz'
$ curl -C - --retry 99 -o $TARBALL $URL$TARBALL
$ tar xzf
in a jupyter notebook ?
** can I change
DIRNAME='2017-08-22-15-45-31_GUDHI_2.0.1-rc1'
to
DIRNAME='gudhi' ?
It would be more readable :-)
thanks again!
Pierre
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eld(3)
> sage: a=2+3*z
> sage: b=3+4*z
> sage: x=polygen(Q3)
> sage: L.=Q3.extension(x^3-a)
> sage: b.is_norm(L)
> False
>
> On 10 July 2017 at 14:23, Pierre <pierre@gmail.com >
> wrote:
> > Hi all !
> >
> > I wanted to know whether
ted fields, PARI has functions accessible through sage to
find points on conics.
If any of the above can be facilitated by Sage for p odd, it would be great.
Thanks!
Pierre
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Thanks everyone for the answers. If i ever reach the stage when i can run
gudhi on some computer, and then the stage when i can install it on my own
computer, then i'll contemplate the project of writing an interface to sage
-- but don't hold your breath...
On Friday, May 12, 2017 at 7:57:31
quite old.)
Incidentally, if anybody has managed to install GUDHI either on Mac OSX or on
SMC, i'd be interested to know how this was achieved.
Thanks!
Pierre
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Does somebody know the differences between the "image()" and
"column_space()" commands on a matrix ? The definition seems the same but
the answers are different...
Thanx.
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sage-7.6 fails on fedora-21 (7.4 built ok). error occurred during dochtml
build of graphs.
Traceback (most recent call last):
File "", line 131, in
File "", line 106, in invoke
File "", line 113, in newest_first_order
File "", line 92, in print_stackframe
File
changed names?
thanks,
Pierre
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Hi, I'm trying to use Sage 7.3 on Ubuntu. I've downloaded the archive, used
archive manager to extract it and got a directory SageMath. Inside I double
click the sage executable. The terminal opens and after a lot of lines
starting with "patching" it says "SageMath version 7.3, release
oh, I see. Tricky one.
On Wednesday, May 25, 2016 at 5:24:48 PM UTC+2, vdelecroix wrote:
>
> On 25/05/16 10:11, Pierre wrote:
> > By that reasoning, you should expect libgap lists to start with 1, as in
> a
> > GAP console, but they start with 0 as python lists (and
By that reasoning, you should expect libgap lists to start with 1, as in a
GAP console, but they start with 0 as python lists (and i think it's GREAT
: with the old pexpect interface, the lists starting with 1 used to create
a lot of trouble).
I'm pretty sure the idea was to have libgap lists
PS on another example, using + on two GAP lists of length 2 and 6
respectively has produced a list of length 6, and I think it contains sums
of elements taken from the lists, somehow.
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Hi,
This is on SMC. I think the following used to work (?), but I may be wrong.
sage: G= libgap.SymmetricGroup(3)
sage: foo= G.GeneratorsOfGroup()
sage: foo + foo
...
ValueError: libGAP: Error, no method found! Error, no 1st choice method found
for `+' on 2 arguments
One may try list(foo) +
> It also seems that "SymmetricGoup" has its elements live in a pexpect gap,
> not in libgap. It might be attractive to move that too.
>
I was wondering about that: so many sage objects are really GAP objects
wrapped up, with the old code using the pexpect interface, is the plan to
re-write
.
Of course one can use libgap.eval( p.cycle_string() ) but that's awkward. As is
libgap.PermList( p )
Pierre
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sage: isContainedIn = libgap.function_factory(r'\in')
> sage: isContainedIn(g, G)
> true
>
>
>
> On Wednesday, March 30, 2016 at 11:39:14 AM UTC+2, Pierre wrote:
>>
>> Hi !
>>
>> I've been playing with libgap, which is great (I love the fact that lists
>>
p(G, g) function, implememting
solution (3). It would work in general (eg, verifying whether g is in a
given conjugacy class, as returned by G.ConjugacyClasses() ).
thanks!
Pierre
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T
OK thanks, i'll do that.
On Saturday, March 12, 2016 at 6:55:06 AM UTC+1, jori.ma...@uta.fi wrote:
>
> On Fri, 11 Mar 2016, Pierre wrote:
>
> > This is from the documentation of the plot method of the Digraph class:
> >
> > sage: T = list(graphs.trees(7))
> >
misunderstand the 'heights' option, but I
thought that the vertices 3 and 6, for example, would be on the same horizontal
line, as would be 4, 5, 1. Not the case for me at all !
Thanks for you help,
Pierre
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On Wednesday, February 24, 2016 at 6:53:18 PM UTC+1, Volker Braun wrote:
>
> And emacs can edit remote files via ssh using tramp-mode, so you can run
> just run emacs locally:
>
> C-x f ssh://hostname:filename
>
>
Sorry i took me a while to respond, i kind of forgot about this thread for
a
of
keys do not work, like CTRL + , which is how i produce a \ normally. Given
that the meta key is ESC, all in all i don't use emacs much under SMC.
On Wednesday, February 24, 2016 at 5:57:40 PM UTC+1, Pierre wrote:
>
>
>> Probably yes, but what you really want is a workaround. I w
>
>
> Probably yes, but what you really want is a workaround. I would suggest
> you to write a normal .py file and import it in a sagews file. Start the
> cell where you import with "% auto" and this cell will be executed
> automatically on (re)start. I'm guessing that would help you.
>
>
PS and yes, my init.sage would be relevant even to use GAP, although not an
awful lot -- in fact i have written a magic function to replace %gap, it
works a little better for me, but I concede that it's not crucially
important :-)
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(only?) way to do it on SMC is via a sage worksheet and the "%default_mode
gap" magic.
(I cannot really use GAP from the command line, as the brackets [ ] on my
keyboard do not work in the SMC terminal !!!)
thanks !
Pierre
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it myself.
Come to think of it, I have the same question about ipython/sage in a
terminal.
I seem to remember that with my local sage notebook, ages ago, this was the
default, you had to click somewhere to see the traceback, I very much
enjoyed that !
thanks !
Pierre
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How can we easily import .ipynb from SageMathCloud to SageMath (desktop)
I tryed to download my NB but it saved as JSON file...
And in SageMath we cannot import ipynb file (), but rst(?) HTML(??!!)
but none of them give us what we need having a nb (.ipynb) file
that we can execute, modifie,
Oh yes, refreshing the page in my browser revealed that the computation was
in fact over. I don't get the same minimal polynomial:
Number Field in a with defining polynomial y^64 - 16*y^63 + 120*y^62 - 552*y^61
+ 1060*y^60 + 9192*y^59 - 109548*y^58 + 594136*y^57 - 1818336*y^56 +
1418016*y^55 +
6 +
> 77999223597440406896*y^15 - 90519472303245161928*y^14 +
> 54028667281044557920*y^13 + 41367302912532250064*y^12 -
> 168969147746602154528*y^11 + 261672020286578277832*y^10 -
> 244896792544276915584*y^9 + 104844130048796679732*y^8 +
> 105596980415747506608*y^7 - 299690125602975518832*y^6 +
>
= number_field_elements_from_algebraics([ra, rb, rc, rA, rC,
rdelta], minimal= True)
However this last command takes forever. (This is on SMC.)
Is there anything else that I could try?
Thanks !
Pierre
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"sage-su
>
>
> (1) As in your first construction but replace each field constructed
> after the forst with the corresponding absolute field.
>
>
I have tried this but got something like:
F0.= NumberField(x^2 - 2)
F1.= F0.extension( polygen(F0)^2 - 5 )
L= F1.absolute_field("bar")
L(foo0)
...
these functions at all, I have to say (re.py???)
This is in a jupyter notebook.
Thanks !
Pierre
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I can answer a bit of my own question:
(2) I've been trying to improve it to
def showplot(g, **kwargs):
import IPython.display
save(g, 'a.png', kwargs)
IPython.display.display(IPython.display.Image('a.png'))
and tried showplot(my_plot, dpi= 1200) to get a larger image, but
The space is no trouble. But see my second message, i had forgotten the **.
Now that bit works!
Le 21 juil. 2015 23:31, Justin C. Walker jus...@mac.com a écrit :
On Jul 21, 2015, at 07:35 , Pierre wrote:
Hi,
I've been playing with the Jupyter notebook in sagemathcloud, it's very
nice
PS in case i did not make myself clear: things work for reasonable values
of dpi, but not 1200 which is silly.
Le 21 juil. 2015 23:33, Pierre Guillot pierre.guil...@gmail.com a écrit
:
The space is no trouble. But see my second message, i had forgotten the
**. Now that bit works!
Le 21 juil
this in the
documentation somewhere)
(4) This is a bit unrelated, but: does the editor on sagemathcloud (the one
that pops up when you click on a .sage file) have any auto-completion
features at all?
Thanks !
Pierre
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, by the way, please let me know !
(I myself haven't got an intuition yet for how difficult this is.)
Thanks !
Pierre
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as a fraction P(x)/Q(x), exactly as in your
other post.
am I missing something?
Pierre
coefficients for each power of f. I have done something similar where
K was a number field of quite large degree and d was about 200, so I'm
sure it is possible in your case.
If you post code which
PS sorry i wrote
to be clear : i know there is at least a relation
P_0(x) + P_1(x) f + P_2(x) f^2 + ... + P_d(x) f^d
i meant to end with = 0 .
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.
It seems that inverses are taken, since RubiksCube().move(R*U) displays
something that corresponds to U^-1 * R^-1 (by which I mean U^-1 first, then
R^-1).
In a nutshell: the __str__ method in RubiksCube seems to be broken, somehow.
This is all quite confusing !
best
Pierre
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I have just realized that CubeGroup().faces(U) also goes counterclockwise
! what a mess !
On Thursday, March 19, 2015 at 1:07:12 PM UTC+1, Pierre wrote:
Hi,
I have just realized this, and thought it would be helpful to know for
anyone playing with Sage's Rubik's cube abilitites. Here
:18 PM UTC+1, David Joyner wrote:
On Thu, Mar 19, 2015 at 8:07 AM, Pierre pierre@gmail.com
javascript: wrote:
Hi,
I have just realized this, and thought it would be helpful to know for
anyone playing with Sage's Rubik's cube abilitites. Here it is:
While the following 3
On Monday, September 8, 2014 2:38:45 PM UTC+2, simon.ei...@vol.at wrote:
Hi all,
I am not sure if this message went through or not but it seems not.
I just have a quick question.
How easy is it now to compile sage 6.3 on a raspberry pi?
I tried that with version 5.13 and this was
That's the first time I use Sage-Magma interface.
Am I doing something wrong?
Thanks in advance.
(Latest sage beta, magma 2.19-2)
sage: p = next_prime(14)
sage: n = next_prime(13)
sage: k = GF(p)
sage: R.x = PolynomialRing(k)
sage: f = R.irreducible_element(n)
sage: g = R.irreducible_element(n,
with region_plot when I was drawing the triangles
individually. Then I wrote up some code to draw a tiling (quite a lot of
time, as you can imagine!), and was really disappointed to see the end
result all scrambled because of this bug!
should I use something other than region_plot?
thanks!
Pierre
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definition I don't know how to find.
On Friday, August 29, 2014 7:19:32 PM UTC+2, Pierre wrote:
Dear all,
Let's draw two discs with region_plot:
sage: disc1= region_plot(lambda x, y : x^2+y^2 1, (x, -1, 1), (y, -1, 1))
sage: disc2= region_plot(lambda x, y : (x-0.7)^2+(y-0.7)^2 0.5, (x, -2
To track further the code you can use the magic import_statements
inside Sage which tells you where to find a class/function
{{{
sage: import_statements('HyperbolicTriangle')
from sage.plot.hyperbolic_triangle import HyperbolicTriangle
sage: HyperbolicTriangle??
}}}
It appears
You can try
sage: x= polygen(GF(2), a)
and try a few expressions involving x. For example
sage: 2*x
0
since 2=0 in GF(2).
Pierre
On Tuesday, March 11, 2014 3:25:04 PM UTC+1, Prakash Dey wrote:
I am new to sage.
x=var('a')
print x*x*x*x+x*x*x+x*x+x
How to do this symbolic algebra
.
Anyone knows about this?
thanks!
Pierre
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On Monday, July 15, 2013 10:14:35 AM UTC+2, Emmanuel Charpentier wrote:
Dear William,
Le lundi 15 juillet 2013 à 00:48 -0700, William Stein a écrit :
On Mon, Jul 15, 2013 at 12:15 AM, Emmanuel Charpentier
emanuel.c...@gmail.com javascript: wrote:
Dear William,
Le dimanche
On Friday, June 21, 2013 6:43:29 PM UTC+2, William stein wrote:
-- Forwarded message --
From: Savin Diana savin...@univ-ovidius.ro javascript:
Date: Thu, Jun 20, 2013 at 2:46 AM
Subject: question - SAGE
To: wst...@uw.edu javascript: wst...@uw.edu javascript:
Dear
to
reorder the variables until things work!!...
any idea, anyone?
thanks!
Pierre
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in principle do the trick. However the
documentation is for GAP rather than Sage and I'm not sure how to proceed.
I thought maybe this would be trivial for someone around here...
thanks!
Pierre
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Thanks, I thought about this, but I'm not sure how to pick central elements
of order 2 in a group, or more precisely in a group that is given by
gap(SmallGroup(n,i)). I can try C= G.centre() and then get C.generators()
but i'm not sure if I can assume anything about these generators (I doubt
return True
... or something.
2013/1/14 Pierre pierre.guil...@gmail.com:
Thanks, I thought about this, but I'm not sure how to pick central elements
of order 2 in a group, or more precisely in a group that is given by
gap(SmallGroup(n,i)). I can try C= G.centre() and then get C.generators
sorry G should be H throughout, in my last post.
2013/1/14 Pierre Guillot pierre.guil...@gmail.com:
partially answering my own question: for the lame but easy method,
one can do the following. Having a putative group H, try:
for x in [g for g in G.Centre().Elements() if g.Order() == 2
Le lundi 8 octobre 2012 18:37:45 UTC+2, Pierre a écrit :
Consider the functional equation
(f*z + z * L(z,f)^2 + z * L(z,f+1) - L(z,f) == 0)
This defines implicitly a bivariate function L(z,f). My goal is to find
the Taylor development of L(z,0). I know from
Bernhard
that the result is
z^2 + 2z^3 + 4z^4 + 13z^5 + 42z^6 + 139z^7 + 506z^8 +1915z^9 + 7558z^10 + · · ·
How do I do that in SAGE?
Thank you in advance.
Pierre
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Today at some Sage meeting in Paris, we encountered this problem once more
with Sage 4.7.2 vbox image within Windows 7.
The image was correctly (or seemingly correctly) preconfigured with 8000 on
the outside pointing toward 8000 on the inside and into 22.
Once more it was possible to ssh
And I think that the port 8000 was dysfunctional because some service
already listened on that port (I don't have the computer at hand anymore so
cannot check...)
as suggested by this result from a simple google query:
http://superuser.com/questions/360236/why-is-system-listening-on-port-8000
On Wednesday, May 9, 2012 4:40:32 PM UTC+2, Volker Braun wrote:
On Wednesday, May 9, 2012 10:33:22 AM UTC-4, Jean-Pierre Flori wrote:
http://superuser.com/questions/360236/why-is-system-listening-on-port-8000
My money is on the following answer posted on the above ask page
There is some Sage meeting this afternoon in Paris.
I have a Windows 7 installation on my laptop, I'll give a VirtualBox
installation a try, maybe I'll be more lucky than last time.
That was particularly painful to have people ready to try Sage on their
computer at a previous meeting, but being
I think I had the same problem although the VirtualBox port forwarding was
correctly configured and I could not resolve it in the little time I had.
My late conclusion was that maybe the Windows firewall is blocking the
connection (even though it's a local one...) ?
Could you try connecting to
That's good news. It's a long way until usage of Sage becomes standard
in France, unfortunately. I hear that Lyon has made the transition
from Maple and has been confronted with a lot of resistance from
teachers who did not want to change their old habits...
Here in Strasbourg we were about to
to this message, so I'll have to
describe the result as very close to the Cayley graph of PSL(2, ZZ)
rather than SL(2, ZZ)!! it looks as if one of my generators has order
2!!
does anyone know what is going on?
thanks!
Pierre
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.
thanks again,
pierre
On 13 mar, 13:50, Tom Boothby tomas.boot...@gmail.com wrote:
Pierre,
Don't rely on the picture!
sage: U = set(gr.edges())
sage: V = set(gr.reverse().edges())
sage: U.intersection(V) #for me, this is the empty set
On Tue, Mar 13, 2012 at 3:26 AM, Pierre pierre.guil
i think i see what is going on. By reducing the number of vertices
plotted, it appears that the double edges are really little clusters
of four edges!
On 13 mar, 21:27, Pierre pierre.guil...@gmail.com wrote:
Dear Tom,
Thanks for your answer! I get the empty set, too. I really wonder what
PY_NEW with a class that *requires* parameters to its
__init__?
** more generally, is there a Cython tutorial that would be (just)
sufficiently advanced to cover such an example?
thanks!
Pierre
On 13 fév, 20:13, William Stein wst...@gmail.com wrote:
On Mon, Feb 13, 2012 at 11:07 AM, Jason Grout
, Pierre pierre.guil...@gmail.com wrote:
Hey, thanks for all the responses. I use Cython occasionally, but i
tend to restrict myself to basic C types and simple functions which do
not import anything -- it seems I can learn an awful lot by studying
your examples!
Can i ask the following questions
Nope! If you just want to use Python's complex data type you could
rewrite the code
to not use any imports.
just to be clear: you mean that the first two lines of Jason's code
can be deleted, the class Matrix2 would still work as such?
You may find chapter 3 of this book I'm writing
Hitting the nail one the head! sounds like your solution (I mean numpy
arrays with CDF elements, which I didn't know was possible) is going
to be perfect for me.
Thank you so much!
On 13 fév, 01:30, Nils Bruin nbr...@sfu.ca wrote:
On Feb 12, 1:39 pm, Pierre pierre.guil...@gmail.com wrote: i
I see. Well I *do* have hundreds of 2x2 matrices to multiply out so
i'm better off storing them as numpy matrices throughout... thanks for
your explanations though.
Pierre
On 13 fév, 18:32, Robert Bradshaw rober...@math.washington.edu
wrote:
On Sun, Feb 12, 2012 at 4:30 PM, Nils Bruin nbr
pierre
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Dear all,
Is there any way to draw easily a 3D multicolor torus with Sage ?
I.e. using parametric_plot3d and an equivalent of adaptive=True,
color=rainbow(60, 'rgbtuple') options ?
Cheers,
JP
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, Pierre pierre@gmail.com wrote:
thanks for this. I thought about sage this afternoon and decided the
easiest would be to pay a visit to david green and yourself in Jena
and pick your brains... when i checked your homepage just to be
certain and found out you're in Galway now ! Damn. (I
Python was recently updated to not build with OpenSSL support on
Debian, so I cannot build Sage anymore on my Debian Sid.
http://packages.debian.org/changelogs/pool/main/p/python-defaults/python-defaults_2.6.6-14/changelog
python2.6 (2.6.6-9) unstable; urgency=low
* Build without OpenSSL v2
This is now #11561.
On 1 juil, 10:59, Jean-Pierre Flori jpfl...@gmail.com wrote:
Python was recently updated to not build with OpenSSL support on
Debian, so I cannot build Sage anymore on my Debian Sid.
http://packages.debian.org/changelogs/pool/main/p/python-defaults/pyt...
python2.6 (2.6.6
And is nothing but a duplicate of #11447...
Sorry for the noise.
On 1 juil, 11:42, Jean-Pierre Flori jpfl...@gmail.com wrote:
This is now #11561.
On 1 juil, 10:59, Jean-Pierre Flori jpfl...@gmail.com wrote:
Python was recently updated to not build with OpenSSL support on
Debian, so
This is now #11521.
On 16 juin, 17:13, Jean-Pierre Flori jpfl...@gmail.com wrote:
The following piece of code also seems to leak memory.
The problem seems to occur while resolving the action of ZZ on E.
sage: K = GF(155,'t')
sage: a = K.random_element()
sage: while 1:
: E
The following piece of code also seems to leak memory.
The problem seems to occur while resolving the action of ZZ on E.
sage: K = GF(155,'t')
sage: a = K.random_element()
sage: while 1:
: E = EllipticCurve(j=a); P = E.random_point(); 2*P;
On 16 juin, 02:51, Jean-Pierre Flori jpfl
Thanks a lot, I'll have a look at that.
On 15 juin, 14:26, Alastair Irving alastair.irv...@sjc.ox.ac.uk
wrote:
On 14/06/2011 21:58, Jean-Pierre Flori wrote:
On 14 juin, 08:44, Simon Kingsimon.k...@uni-jena.de wrote:
Since sage-nt seems to agree that it is a bug, I opened trac ticket
S the memleak seems to be located within creation or rather coercing
to MPolynomial_libsingular.
Calling gc.collect() whithin the loop seem to fix or are least
attenuate the problem.
However, calling afterwards does not free memory back.
On 15 juin, 14:29, Jean-Pierre Flori jpfl...@gmail.com
I finally found the memleak in different si2sa_* functions in
sage.libs.singular.singular and provided a fix on Trac.
On 15 juin, 21:50, Jean-Pierre Flori jpfl...@gmail.com wrote:
S the memleak seems to be located within creation or rather coercing
to MPolynomial_libsingular.
Calling
But theres another memleak in the roots method of polynomial_zzpex...
On 16 juin, 00:09, Jean-Pierre Flori jpfl...@gmail.com wrote:
I finally found the memleak in different si2sa_* functions in
sage.libs.singular.singular and provided a fix on Trac.
On 15 juin, 21:50, Jean-Pierre Flori jpfl
Which seems to come from list() method.
On 16 juin, 00:09, Jean-Pierre Flori jpfl...@gmail.com wrote:
I finally found the memleak in different si2sa_* functions in
sage.libs.singular.singular and provided a fix on Trac.
On 15 juin, 21:50, Jean-Pierre Flori jpfl...@gmail.com wrote:
S
and from ZZ_pE_c_to_list function
On 16 juin, 01:18, Jean-Pierre Flori jpfl...@gmail.com wrote:
Which seems to come from list() method.
On 16 juin, 00:09, Jean-Pierre Flori jpfl...@gmail.com wrote:
I finally found the memleak in different si2sa_* functions
Ok so the memleak comes from ZZ_pE_to_ZZ_pX in
c_lib/src/ntl_wrap.cpp
It should have been fixed by trac #1092, but has been reverted by
commit 8503.
I'll reopen #1092.
On 16 juin, 02:07, Jean-Pierre Flori jpfl...@gmail.com wrote:
and from ZZ_pE_c_to_list function
On 16 juin, 01:18, Jean-Pierre
this is now 11495
On 16 juin, 02:46, Jean-Pierre Flori jpfl...@gmail.com wrote:
Ok so the memleak comes from ZZ_pE_to_ZZ_pX in
c_lib/src/ntl_wrap.cpp
It should have been fixed by trac #1092, but has been reverted by
commit 8503.
I'll reopen #1092.
On 16 juin, 02:07, Jean-Pierre Flori jpfl
On 14 juin, 08:44, Simon King simon.k...@uni-jena.de wrote:
Since sage-nt seems to agree that it is a bug, I opened trac ticket
#11474.
Good !
About the original memleak, I tried looking at how
EllipticCurves_finite_field (maybe not correct name) are created but
could not find anything fishy,
, Jean-Pierre Flori jpfl...@gmail.com wrote:
Using the following piece of code makes the memory footprint of sage
grow indefinitely:
I just noticed that elliptic curves are instances of
sage.structure.parent.Parent, but violate the unique parent
assumption:
sage: K = GF(150,'t')
sage: j
FYI, the interface to Maxima changed in 4.7.1.alpha0 IIRC, so you
could also try one of the more recent alphas available at:
http://sage.math.washington.edu/home/release/
The things with MARKER are not involved in that new interface.
On 10 juin, 08:34, NigelSmart ni...@cs.bris.ac.uk wrote:
Hi
Dear all,
Using the following piece of code makes the memory footprint of sage
grow indefinitely:
sage: K = GF(150,'t')
sage: j = K.random_element()
sage: while 1:
:E = EllipticCurve(j=j)
:del E
:
This seems to be less dramatic with finite fields of char != 2 and
inexistant
On my computer I get a segfault just doing :
--
| Sage Version 4.7.rc1, Release Date: 2011-04-30 |
| Type notebook() for the GUI, and license() for information.|
sage: R.t = Zq(8,2,'fixed-mod')
sage: 1/t
(t^2 + 1) + (t^2 + 1)*2 + O(2^2)
sage: 1/(t+t^2)
/home/jp/boulot/sage/sage-4.7.rc1/local/lib/libcsage.so(print_backtrace
+0x31)[0x7f3d2a9afdf2]
/home/jp/boulot/sage/sage-4.7.rc1/local/lib/libcsage.so(sigdie+0x14)
[0x7f3d2a9afe24]
I'll take care of it with a fix hopefully.
The value 16 is of course related to FF implementation.
From 16 it uses NTL and GF2X.
There's something nasty occuring in charpoly() or deeper.
On 27 mai, 14:27, Simon King simon.k...@uni-jena.de wrote:
Hi Jean-Pierre,
On 27 Mai, 14:08, Jean-Pierre
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