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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27;re 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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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 PM
plicated 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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micField(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 >
> wrote:
> > Hi all !
> >
> > I wanted to know whether Sagemath had any su
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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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
n U is, taken by CubeGroup and given in
Joyner's book, is just not the one appearing when you print foo.
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:
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&
:18 PM UTC+1, David Joyner wrote:
>
> On Thu, Mar 19, 2015 at 8:07 AM, 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 it i
d, 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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nd that i
want to write it explicitly 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 possib
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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"project" is like a separate computer running? (it
feels very much like it, and i also think i remember reading 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-co
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 ima
don't understand these functions at all, I have to say (re.py???)
This is in a jupyter notebook.
Thanks !
Pierre
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:
K, gens, phi= 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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>
>
> (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)
...
TypeError:
94147621118*y^16 +
> 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 - 299690125602975518
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 +
ll 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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(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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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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>
>
> 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.
>
>
thank
combinations 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
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 couple
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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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))
>
_membership(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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e: 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 lis
lists.
Of course one can use libgap.eval( p.cycle_string() ) but that's awkward. As is
libgap.PermList( p )
Pierre
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> 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 e
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) + l
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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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 b
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
erhaps read_dot
has changed names?
thanks,
Pierre
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To post to
tion
from its string !
Is there a way around this ?
thanks
pierre
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ooops. So sorry for not reading the doc fully. The answer is to use
cycle_string(singletons= True).
pierre
On Jul 3, 7:38 pm, Pierre <[EMAIL PROTECTED]> wrote:
> hi all,
>
> I'm confused with the cycle notation for permutations (bug ?)
> While the following works:
>
! (of course it's not awfully complicated to
write from scratch, but...)
thanks
pierre
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For more options,
educe(lambda x,y : x+y, list) which is cumbersome).
along the same lines, my class has a __str__() method, and 'print x'
works. But 'print L' where L is a list of such objects does not
work...
any idea?
thanks a lot!
pierre
--~--~-~--~~~---~--~--
t happens if __repr__ simply returns the
same as __str__ ?
thanks again!
pierre
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any...) even
if they eventually give up on maths!) I'm also trying to tell my
colleagues about sage. The main obstacle, or rather the first, is that
we are running Solaris...
(btw very interested in a binary for Solaris 10, on an x86, 64 bits if
you have one...)
anyway, keep up the good work!
cheer
nary ??
i sort of feel like a charlie !
cheers
pierre
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hind it ? (btw i'm obviously not root on the
solaris machine)
also, what sort of tests should i run ? is there a full test for
sage ?
to finish with, why is the sage folder much smaller than the one i
have on my linux (ubuntu) machine ?
thanks!
pierre
--~--~-~--~~~---
.save("image.png")
but no luck.
any thoughts ?
thanks!
pierre
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-~--~~~~--~~--~--~---
ried
earlier: it would be good to have this 't' object working properly, so
that you could change the tachyon options in passing (it does not seem
possible with the solution i just gave).
On Aug 19, 3:39 pm, Pierre <[EMAIL PROTECTED]> wrote:
> hi there,
>
> Suppose i hav
I'm on sage 3.0.2 on ubuntu, i've tried sage --upgrade and got this:
checking for suitable m4... configure: error: No usable m4 in $PATH
or /usr/5bin (see config.log for reasons).
Failed to configure.
i can't find the file config.log anyway.
help ?
--~--~-~--~~~---~-
ah, ok, m4 was just plain missing. I've installed it, the rest was
there, let me try again !
On Aug 28, 3:32 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Thu, Aug 28, 2008 at 6:27 AM, Pierre <[EMAIL PROTECTED]> wrote:
>
> > I'm on sage 3.0.2
it seems to have worked ! thanks !
On Aug 28, 4:03 pm, Pierre <[EMAIL PROTECTED]> wrote:
> ah, ok, m4 was just plain missing. I've installed it, the rest was
> there, let me try again !
>
> On Aug 28, 3:32 pm, "William Stein" <[EMAIL PROTECTED]> wrote
to believe that sometimes
sum() just gets the wrong answer (things that were supposed to commute
didn't commute; but they were sums of things which did commute).
Thoughts anyone ?
Pierre
--~--~-~--~~~---~--~~
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perhaps i should have posted to sage-devel instead ? i don't even know
how to "properly" report a bug.
On 10 sep, 18:53, Pierre <[EMAIL PROTECTED]> wrote:
> hi there,
>
> i thought i'd report this bug, even though it's hard to reproduce and
> n
thanks for all this !
> For the record, though, people on this list definitely respond faster
> if you try to whittle down your examples to the smallest case you can
> find that creates the error.
I know. I just had no idea whatsoever which matrices would create the
error ! in fact it took quite
cool !
now look for another bizarre bug report from me in a coming thread...
On Sep 15, 7:03 pm, "Craig Citro" <[EMAIL PROTECTED]> wrote:
> Pierre,
>
> You'll be happy to hear that I got the following response from the
> Singular team this morning:
>
> ==
- y12)
y13*y15 + y9 - y12
Now what's up with that ? shouldn't it be y13*y15 + 2*y9 ? that's what
i expect from the term 'reduction' anyway. Is this normal or is it a
bug ? if it's a bug, could it influence the equivalence x in J iff
J.reduce(x) == 0 ?
So if th
What did you put in J ? in fact, the following already produces the
bug (sorry for not trying earlier, i thought i did try and there was
no bug... must have changed a little something):
sage: k= CyclotomicField(3, "w")
sage: A= PolynomialRing(k, ["y9", "y12", "y13", "y15"])
sage: y9, y12, y13, y1
cool, thanks a lot !
On Sep 16, 6:42 pm, Martin Albrecht <[EMAIL PROTECTED]>
wrote:
> On Tuesday 16 September 2008, Pierre wrote:
>
>
>
> > What did you put in J ? in fact, the following already produces the
> > bug (sorry for not trying earlier, i thought i di
> Alternatively, the forementioned patches might be interesting to you since
> they speed up multivariate polynomial arithmetic over absolute number fields
> dramatically. All they need are reviews ... hint, hint ;-)
i know absolutely nothing about patches, reviewing, contributing to
sage or tha
> Ironically pretty much everything works under Solaris now but the
> notebook. I think that issue is easy to fix (RAND_MAX related
incidentally, is it possible to get knoboo to work on solaris instead
of the notebook ?
(sorry if this question is somewhat besides the point)
--~--~-~--~--
the gedit editor, shipped with ubuntu and most gnome-based systems, is
much underrated, it is in fact a very good choice. It is highly
configurable, comparable to emacs i dare say, and you use python
instead of lisp to configure it ! for example i have easily added to
gedit a couple of tools to lo
> Do you have these changes posted somewhere? I'd like to try it out, if
> possible.
er, no, but here are a few hints. First try
sage -grep "def" | grep "def " >~/.sage/sage_doc
so you have a file in your .sage folder containing all the lines in
SAGE's code containing the word "def " (i don't
quot;.*)\(")
choices= [ regexp.search(s) for s in poss]
choices= filter(lambda x: x is not None, choices)
choices= [x.groups()[0] for x in choices]
for choice in choices:
print choice
-----
if there were a massive popular
buffer
and below
C-c C-c python-send-buffer
(that binding is currently shadowed by another mode)
I've looked at sage-mode.el and sage-send-command does look like it
relies on python-send-command, i've got to say (but i'm not very good
with lisp).
Help anyone ?
thanks !!
pierre
--~-
are you able to select "native tex fonts" in the jsmaths preferences ?
i can only use "unicode fonts", they look okay but they're not the
usual Tex fonts, that's for sure.
On Dec 1, 5:17 pm, Jason Grout <[EMAIL PROTECTED]> wrote:
> dpvc wrote:
> > The real problem is not the missing fonts, but th
Here's a solution to my problem -- I'm pretty sure it could be useful
to other people. Trying to follow the instructions above, I
misinterpreted "unzip the .zip here" (i *always* get these things
wrong).
the way i understood it, i ended up with files like /home/
foobar/.fonts/cmr10.ttf. However,
know. Note that
I've got more information on these algebras yet (Stiefel-Whitney
classes...)
And shall I think of a mechanism for people to download ALL the
examples at once rather than separately ? (perhaps useful to try a
conjecture about unstable modules ?)
suggestions
7;ll
use a dict indexed by the "group ID" as GAP understands it.
will keep you posted, but don't hold your breath, i'm afraid i have a
lot to do these days !
pierre
On Jan 19, 4:57 pm, John H Palmieri wrote:
> On Jan 19, 6:28 am, Pierre wrote:
>
> > hi all
>
and, if i try again, i get the unexpected:
sage: I.groebner_basis()
verbose 0 (1790: multi_polynomial_ideal.py, groebner_basis) Warning:
falling back to very slow toy implementation.
[a, b]
what's up ? i'm using sage 3.1.4.
hich
are case-sensitive ?
cheers
pierre
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surely there's an easy fix for this:
sage: G= PermutationGroup([])
sage: G
Permutation Group with generators []
sage: G.is_abelian()
---
TypeError Traceback (most recent call
last)
/Users/pedr
i'm on 3.1.4... time to upgrade, perhaps !
On Feb 10, 1:42 pm, mabshoff wrote:
> On Feb 10, 3:18 am, Pierre wrote:
>
> Hi Pierre,
>
> > surely there's an easy fix for this:
>
> > sage: G= PermutationGroup([])
> > sage: G
> > Permutatio
le_sage failed.
well i guess i'll just download another binary, as usual ! but if
there's a one-line fix, i'd be happy/curious to know about it.
pierre
--~--~-~--~~~---~--~~
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T
sense of pride. I also didn't have to
create a LIB link to lib, which is cool (the OS X case-sensitive
filesystem thing). I'll see if the updates indeed go smoother, but i
should expect that they do.
thanks !
pierre
--~--~-~--~~~---~--~~
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that i've
ever used it much anyway).
thanks !
pierre
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roup()
sage: r= rubik.R()
sage: l= rubik.L()
sage: u= rubik.U()
sage: d= rubik.D()
sage: f= rubik.F()
sage: b= rubik.B()
sage: mr = r^(-1)*l
sage: flip= (mr*u)^3*u*(mr^(-1)*u)^3*u
sage: P= rubik.plot3d_cube(flip); show(P)
the result is a bit of a mess.
what am i getting wrong ?
thanks !
Pierre
-
the picture. I
myself was a student in england so i'm a bit different in this
respect...
however i'm sure i'll use the book when teaching sage, providing that
happens.
thanks
pierre
--~--~-~--~~~---~--~~
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? So there's no need to rely on sagenb.org (which i suspect is
having trouble today, it seems very slow from here). Of course I mean
that we don't have sage running on the university servers yet...
thanks !
Pierre
--~--~-~--~~~---~--~~
To post to this gro
> Interacts don't work on published worksheets for security reasons.
Ah ! that explains it. Could do an "animate" instead...
> Note that sagenb.org is not
> designed to support classes as a class sage server; rather, it's
> designed to give a person a way to try out Sage.
Is there anything wr
what happens if you open a terminal, go to the directory where sage
was extracted, and type ./sage ?
On Mar 25, 10:08 pm, christophe van der putten
wrote:
> Hi,
> I install Linux Ubuntu in my PC (Intel Pentium Dual Core, 2Gega RAM),
> after that i extract the version sage3.4 on this OS. And w
ear
this from a colleague) these matrices (and their sums, transpose, etc)
show up all the time in numerical stuff.
i know numpy does it, so is it there for sage matrices also ?
thanks
pierre
--~--~-~--~~~---~--~~
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ive. But
i thought it would give an idea of an opinion that's around, and
feedback is always good, right ?
pierre
On 19 juin, 15:59, Jason Grout wrote:
> Harald Schilly wrote:
> > On Jun 19, 12:50 pm, Pierre wrote:
> >> i know numpy does it, so is it there for sage matrices also
> Of course, there are a lot of different pieces of software in the
> background. One strength of Sage is that it provides a uniform way of
> communicating with all these pieces of software, namely via Python/
> Cython. This is like a good travel agent: You say that you want to go
> from London to
what about the following ?
y=0.25
plot(lambda x : f(x, y), (0,1) )
to try different values of y on the same graph, go:
sum( [plot(lambda x : f(x,y), (0,1)) for y in srange(0, 1, 0.1)])
and of course there is
plot3d( lambda x, y : f(x, y), (0,1), (0,1) )
Btw it seems the maximum of f(x,y
pply to "numbers", but
that would be re-inventing the idea of the "vector" class, and i
thought re-inventing the wheel was against sage's philosophy.
On the other hand, [ 1 + x for x in [2,3,4,5]] appeals to both
mathematicians and geeks.
yours,
Pierre
--~--~-~-
call it 3G or whatever, don't know if that's universal)
also, now that android supports python, is it possible to install
numpy, or parts of SAGE, directly? anyone has tried that ?
thanks!
pierre
On Aug 3, 3:25 am, Dan Christensen wrote:
> Dan Christensen writes:
> >
the ones written in pure
python (as oppposed to relying on singular or maxima etc) Well, i
guess just having python is already quite cool for quick
computations...
pierre
On 3 août, 16:50, Dan Christensen wrote:
> Pierre writes:
> > I was thinking about buying an android phone, and get
ou should run %upgrade?
WARNING: Loading of ipy_profile_sage failed.
KeyboardInterrupt
KeyboardInterrupt
KeyboardInterrupt
KeyboardInterrupt
KeyboardInterrupt
KeyboardInterrupt
KeyboardInterrupt
quit()
mac-mini-de-pedro-zero:~ pedrozero$
you
21 return self.__class__.__missing__(self, key)
> > ---> 22 raise KeyError(key)
> > 23 def __setitem__(self, key, item): self.data[key] = item
> > 24 def __delitem__(self, key): del self.data[key]
>
> > KeyError: 'SAGE_DOC'
hi all,
two comments:
(1) Simon, let me offer the following pedantic comment which i advise
you to ignore (!). Technically, i believe that writing "a 2-cocycle"
is incorrect anyway, as it should be "a two-cocycle". Likewise, "the
proof splits into 2 cases" should be "the proof splits into two
ca
ith this version ? no more (require 'pyrex "pyrex-mode")
and the like ?
help anyone ?
thanks!
pierre
PS i'm on aquamacs.
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)
(require 'sage-view "sage-view")
(add-hook 'sage-startup-hook 'sage-view)
same problem. What else could I try to see where the issue comes
from ?
pierre
On 2 sep, 18:21, Nick Alexander wrote:
> On Sep 2, 8:52 am, Pierre wrote:
>
> > hi,
>
> > I&#x
this
happens is explained here :
http://effbot.org/zone/pil-decoder-jpeg-not-available.htm
unfortunately, not having installed the PIL manually with a setup.py,
i don't know what to do.
Help anyone ? thanks !
Pierre
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Mac OS X. Sage was compiled from source.
This all seems like a path problem, really.
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F
Is it just me then ? can everyone else use the PIL with jpeg ? i've
got two macs with a slightly different version of leopard, this fails
on both.
On 23 sep, 18:15, Pierre wrote:
> Mac OS X. Sage was compiled from source.
>
> This all seems like a path p
I'd be very interested in a solution (preferably a very simple one:-)
> since I have a mac as well and have experienced the same problem
> you reported.
>
> On Thu, Sep 24, 2009 at 10:22 AM, Pierre wrote:
>
> > Is it just me then ? can everyone else use the PIL with jpeg ?
in C++ a couple of years ago, but converting the sage
polynomial is already too much work...
thanks
pierre
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sage-support-uns
Thanks. This works, but it is so very slow :
sage: foo= (x0 + x1 + x2 + x3)^1;
sage.libs.symmetrica.all.t_POLYNOM_ELMSYM( foo )
e[1] #immediate
sage: foo= (x0 + x1 + x2 + x3)^2;
sage.libs.symmetrica.all.t_POLYNOM_ELMSYM( foo )
e[1, 1] #also immediate
sage: foo= (x0 + x1 + x2 + x3)^3;
sage.
):
> temp = 0
> for p in combinations([0,1,2,3],i):
> temp = temp + prod([xvars[p[j]] for j in range(i)])
> sym.append(sage_eval('e'+str(i), locals=locals())-temp)
> symid = R.ideal(sym+[foo]).elimination_ideal([x0,x1,x2,x3])
> list(symid.gens())
> [
> However, I am not sure if it is efficient to use these commands often.
> Suppose f is a map from basering to some other ring R, and I, J are
> ideals in R. Then, preimage(R,f,I) computes the preimage of I under f.
> I guess internally some Groebner basis computation is done. When you
> then do p
> I guess there will be many people who can offer advise. Just start hacking
> away and others (me included) can help you out once you have concrete
> questions (probably best on [sage-devel])
that's been the plan for years now. Haven't started "hacking" yet...
it probably doesn't help that i hav
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