Hello Fernando,
I want just to say that I liked a lot your book "Introduction to p-adic
numbers" when I bought and read it some years ago.
A very good fun "travel" in number theory. I appreciate the way it process
by extending fields.
I tried to code something in Sage too (Hensel Lemma) but I
Hi Simon.
You surely know better than me :-)
There are many ways for getting help over the internet.
Kind regards.
Dominique.
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One line answer :
a,b,x,y = var('a,b,x,y') ; solve([ x + y == a, x - 2*y == b
],x,y,dontsolve='a,b')
First statement is to declare symbolic vars a,b,x,y and second statement is
for solving in symbolics x,y
Dominique
PS : use asksagemath.org
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I forgot at the beginning of the cell:
c1 = 'black'
ls = ':'
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To post
Directory "videos_images" must be created beforehand using the sagemath
cloud GUI, inside the directory with your .sagews worksheet.
To remove all files, in the ./videos_images you can run next cell...but be
careful, removing files !!!
Dominique
# RUN THIS CELL WITH CARE BECAUSE REMOVING
Hello,
animate() functon is not working anymore in sagemath cloud.
Nowadays, to make a "video" you can store a sequence a picture files (.png)
and run ffmpeg, like in the following cell, I made for displaying
Lindgren's Q-swing of a rectangle.
Most important are the last two commented lines :
About Dima :
tar nowadays doesn't need explicit compression type parameters,
> "tar xf" would work for any gz-complessed or bz2-compressed file...
The old-fashioned way (explicit option or tar command) on Unix/Linux
operating system is :
tar xzvf filearchive.tgz (for gzip-ped tar archive
@Chris : sometimes we will get the career we have not expected at all ...
-)
Just watched last sunday one video interview with Simon (famous math,
philantropic, NY city market and so on .. millionnaire businessman) as
guest : he had never predicted that his math work at young age will be
Why not adding "x" ? (and of cause declaring x in the same way than y and C)
Because
var("x y C")
solve( log(y) == C + log(x) + log(y-1),x,y)
returns
([x == y/(y*e^C - e^C)], [1])
Dominique
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OK Robert : I misunderstood.
I cannot help either
Dominique
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To post
Hello Robert,
I wonder why you want to use the "abs()" function, when the "absolute
value" function has no meaning for complex numbers.
How you define the 'greater than' (>) operator in complex numbers ?
It is hazardous to mix symbolic computing (var, sqrt,..language) and field
Well I will help you a little (I was writing a flaming answer but I
cancelled).
I write again your post in french language, obvious mistakes removed :
"
Bonjour tout le monde.
J'ai installé un hyperviseur de machines virtuelles sur mon ordinateur
personnel, téléchargé la machine virtuelle
+1 agree with William : I am living in very populated town in France (not
Paris) and use daily SMC over the Internet ... and I have a very good speed
(no laps)!!
I must add that I am a paying member in SMC cloud, so... I am actually
working with a web browser internet client of a not so
Hello doctor (gorgon?) zola,
ImportError: libgfortran.so.3: cannot open shared object file: No such file or
directory
message is enough for you to understand that path to your dynamic library
is wrong or you have not the lib gfortran installed
Dominique
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I see only .tar.bz2 files here
: http://www-ftp.lip6.fr/pub/math/sagemath/linux/32bit/index.html
and here : http://www-ftp.lip6.fr/pub/math/sagemath/linux/64bit/index.html
When running sage, you start two "sage" scripts in your Linux shell
environment.
I advice you to begin with debugging these
Thanks Andrey for your report about this package.
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To post to this
Summmary of work done for sagemath ...
http://rpm.pbone.net/index.php3/stat/4/idpl/34786687/dir/fedora_other/com/sagemath-data-polytopes_db-7.3-6.fc25.noarch.rpm.html
(maybe more recent updates?)
I guess pcpa and Jerry James have done great job decompressing databases,
and coding Python
Hello,
It seems that following code in SMC worksheet cell
from sage.geometry.polyhedron.palp_database import PALPreader
#db = PALPreader(dim=1) # returns ValueError: Cannot find PALP database:
/projects/sage/sage-7.5/local/share/reflexive_polytopes/Full1d/zzdb.info
db = PALPreader(dim=2) #
Hello Chis,
I gave up full_simplify() a long time ago ... and now I use my own "trick"
to simplify symbolic equations : using factor().
For example, checking identities :
x,y = var('x,y'); f1(x,y) = (x + y)^2 ; f2(x,y) = x^2 + 2*x*y + y^2 ; diff
= (f1 - f2 + 1).factor(); print "diff =
>
> How do I get a solution similar to the one for flushes?
>
>
I guess you don't hope for the exact same solution, for exercice "hand of
four" than for "flush" :-)
If your question "How do I get" means "How I can code " and is related to
the probability to get hand of four (end of
>
>
> Working for me, just now for cell in worksheet sagemath cloud : I can see
the solid (blue color) for the first plot P.projection().render_solid_3d
Dominique
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+1 with Dima
I cannot help if you don't write the message error and if you have not
given points16-txt file content.
After copying your code in sageworksheet cell and running cell, I have only
the error
IOError: [Errno 2] No such file or directory: 'points-16.txt'
Post too your computer
What I know for sure is : you better had posted your support issue on the
"new" google goup, sage-cell.
And because that's annoying (at least for me) :
- don't use "SAGE" word (it's acronym name of a company not related to
sagemath),
- replace "SAGE online" with "sagemath cloud" (with same
Hello,
You have an answer there :
http://stackoverflow.com/questions/14084317/python-mutable-vectors-are-unhashable-error
Next in my trying code in sagemath cloud (worksheet cell)
Dominique
OP_2 = MatrixSpace(CDF,2,2)
sigma_x = OP_2([0,1,1,0])
sigma_y = OP_2([0,i,-i,0])
sigma_z =
Hello,
Start with that demo example given
here http://combinat.sagemath.org/doc/reference/plotting/sage/plot/animate.html
sines = [plot(c*sin(x), (-2*pi,2*pi), color=Color(c,0,0), ymin=-1,ymax=1)
for c in sxrange(0,1,.2)]
a = animate(sines)
a.show()
I believe you are not so far add some
Hello,
Your question is "basic" but confusing about the result you want from your
code.
"Binary digits" (=bits) are stored everywhere in code data : characters,
integers, floating and so on.
My advice : use numpy (and learn more and more about it).
Read this first :
Trying just now in sagemath cloud worksheet
%auto
r.library('orloca')
and it seems no package orlorca (or depth)
> Error in lines 1-1
> Traceback (most recent call last):
> File
> "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_server.py",
> line 904, in
Thanks Karl-Dieter.
I never tried R ... but you tease me to use it :-)
Just now : sagemath cloud is on "database maintenance" (instability for
some time) and I cannot try easily check your code.
My interest for the median-center is because I am working on geometrical 2D
code.
I already coded
I asked myself the same question, some months ago.
If you get a NO from the sage devel, then you can try code here :
https://gist.github.com/endolith/2837160
https://gist.github.com/endolith/2837160
The Weber point has other names :
https://en.wikipedia.org/wiki/Geometric_median
Dominique
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Hello,
I opened a ticket
Wrong approximate real roots of cubic equation and matrix eigenvalues #412
because frustrating me too much :-) (joking)
Is it ok or am i math foolish ?
Maybe there are two tickets in one : one for Maxima (behind the scene
solver) and one for Sage (converting
Hi Ron,
It's difficult for me to assume the result you guessed, without a full
complete example of tex file displaying the error (try to shorten your tex
file and post it, next time).
I tried next tex content in new file in cloud project without any issue or
error from the pdf previewer...
And ...from my own practice...change Linux rights for /home/m as root
logged in the NFS server computer if /home/m is "not local" filesystem
(check result of "mount")...
Check first if you have one directory "ephemere created, in the same
terminal window and Linux account as your make command
Hello Adrien,
Before sending a support request in panic mode, you should first edit your
post in a text fileand correct it, thinking about what readers will
understand.
Because you should first explain what you were trying to do, and then
giving information about how you failed.
If you
Whole cell :
O = plot(x,(x,0,1),legend_label='$xyz$')
#legend_opts = { 'back_color': 'salmon', 'shadow': False,'fancybox':
'True','fontsize': '6','loc': '1','borderaxespad': '1'};
legend_opts = { 'back_color': 'salmon' , 'shadow': False, 'fancybox':
'True', 'fontsize': '6','borderaxespad' : 1,
Unquote the borderaxespad dict value like this :
legend_opts = { 'back_color': 'salmon' , 'shadow': False, 'fancybox':
'True', 'fontsize': '6','borderaxespad' : 1, 'loc': '1'};
otherwise (checked on cell worksheet in the SAGE cloud)
Error in lines 5-5Traceback (most recent call last):
is "tuts" a nickname for "tutorials" ?
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Hello Nathann,
Thanks again..
Yesterday evening I made a pause about my sagemath worries...and read
(again) one math paper...including Schnyder woods, and once again authors
are
requiring that the graph is "maximum planar" (or "triangulated") and, as
you have discovered, my example is not
"Change the doc"
yes, I am suggesting that for the planar layout; if the input graph is not
maximal planar
and you can add a simple function checking that one graph is maximal planar
(simple to code : loop on each couple of vertices, and add edge made of
this couple, if adding make graph not
Boost provides a make_maximal_planar function ... and this function can be
parametrized by a addEdgeVisitor
http://www.boost.org/doc/libs/1_36_0/libs/graph/doc/make_maximal_planar.html
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@fidelbc : I didn't know that condition about m = 3n - 6 ... but now I
found it (from Euler formula) for example
https://en.wikipedia.org/wiki/F%C3%A1ry%27s_theorem
For drawing a planar and not maximal planar graph, a "straight" edge
drawing would satisfy me
In some papers (for example :
Hello (maybe, I should have written Hell Nathann :-) ),
I want to plot a planar graph and I know (from graph theory) that the graph
can be plotted in various ways.
I have in mind one algorithm to draw planar graphs, removing one cycle and
forking to draw planar sub-graphs either
Graph_1.is_planar(set_embedding=True)
Graph_1.get_embedding()
returns
True{'A': ['E', 'I', 'D'], 'C': ['G', 'E'], 'B': ['D', 'F'], 'E': ['C', 'G',
'I', 'A'],
'D': ['A', 'I', 'F', 'B'], 'G': ['F', 'I', 'E', 'C'], 'F': ['B', 'D', 'I',
'G'], 'I': ['A', 'E', 'G', 'F', 'D']}
Triangle : BDF is
Yes, 0 must be removed of roots sets.
when you ask for support, please post all content of sage cell, like this :
solve([(4*x+5)/(x^2)>=4/(x+5)],x)
There are many posts like yours (for quadratic equations ...) but the
current status is wrong (or no result) computations for "special" symbolic
Thanks Nathann
I just read quickly your answer.
I know that internally vertices are coded as integer numbers and I don't
expect about special behavior with labelling.
My main disappointment is not to get my dream plot using planar layout or
string layout (for string, often I get plot like in
Yes, I say that..
...and one point to notice : maybe my graph has not the condition
in addition, each face of the layout, including the outer face, is assumed
to be a triangle
given in
https://www.ics.uci.edu/~eppstein/gina/schnyder/
because when you see the planar plot, or the result of
Public worksheet to show difference embedding vs plot :
https://cloud.sagemath.com/projects/6429970e-5a78-4aee-a6b1-af1e80542481/files/Planar%20plot.sagews
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Sorry, maybe "clockwise" doesn't mean anything with two neighbours
Mea culpa
Dominique.
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to
I don't understand your call for numerical integration because I chose one
example at :
http://doc.sagemath.org/html/en/reference/calculus/sage/gsl/integration.html
and both twp examples work at sagemathcell
numerical_integral(cos(x)/(1+sin(x)), -pi/6, pi/6) # (1.0986122886681096,
HG's last post translated (as accurate as I can :-)) ...
I I found the following hint : when that file is store in $HOME directory,
then mathjax can be launched.
It looks like the path to subdirectory is not well handledand i don't
know how to fix it.
Dominique, for english language
HG's last post translated (as accurate as I can :-)) ...
I I found the following hint : when that file is located in $HOME
directory, then mathjax can be launched.
It looks like the path to subdirectory is not well handledand i don't
know how to fix it.
Dominique, for english language
+1 for the weird behaviour of symbolic integration...I computed it quicky
without comp as integral -f'/f where f(x) = 1+sin x, whose solution seems
to be a log f function, and since f equals 0 only f for x = -pi/2 + 2k pi
(when sinx = -1), I don't know from which movie is "divergent" coming
Hello Adrian,
You have too many requests in your post.
There are many ways using SAGE mathematical software :
1) using the "old" website www.sagemath.org website : it was a website with
internet browser access and you needed only to be a registered user to use
it. Nowadays "SAGE cloud" has
OK .. what you want is :
from mpmath import *
plot(lambda q: qgamma(mpf(0.5),mpf(q)), (0, .99))
print sqrt(pi)
Bonus (my notation Fq is gammaq function and F is gamma function) :
from https://en.wikipedia.org/wiki/Q-gamma_function : lim Fq(x) q-1 =
F(x)
from
Explaining better what you want, and you get better help...
..now I understand what you are trying to plot (in 2D, for one specific
value of q)
1) Restart worksheet
2) Copy in cell
from mpmath import *
plot(lambda x: qgamma(mpf(x),mpf(0.5)), (0, .99))
3) Run it = you get your plot
Extra :
Trying in the cloud :
1) Code given http://trac.sagemath.org/ticket/19032
var('q,x')
from mpmath import qgamma
plot3d(lambda q,x: qgamma(q,x), (q, 0.5, 3), (x, 2, 10))
= working fine, using plot3d
2) Your code given previously
var('q,x')
from mpmath import qgamma
plot3d(lambda x:
+ 1 with Volker
you can set other different variables too (JAVA_HOME,...) :
http://conjugateprior.org/2014/12/r-java8-osx/
it's usually explained on web sites (Oracle?) or README ... about how to
download and install, the last JRE
You can start with a : which java
at command level (shell
Hello Peng,
I have the same **bad** behaviour with results changing, in my worksheet
cell, after running and restarting the project ad libitum.
When coercing to RR
def mypsi(z):
return psi(RR(z)
i have other random values too.
I can't track down code, because python code includes 1/
Hello Davi and Tiago,
I am very happy you succeed... :-) ... and closed the google thread (some
helped postmen forget simetimes)
So, you are teachers or working for school in Brazil,...,maybe you can post
to William Stein or somewhere in sagecell website,.a quick review about all
your work.
Hello Davi,
Do you want short helping story or long helping story ?
Shortly :
- /dev/log is a UNIX domain socket (read :
https://en.wikipedia.org/wiki/Unix_domain_socket)
- UNIX domain socket is used for inter-process within the same machine
- syslogd, client or server, commonly used /dev/log
I just tried...
1. Using internet browser, go to : https://github.com/sagemath/sagecell
2. Click : Download ZIP and sagecell-master.zip was downloaded
..., if you cannot download, please explain exactly what you did
(commands or steps), in order people can help you better (with no lost
time
Not so much time needed to google sagemath Horner in order to get an
answer...
#
http://doc.sagemath.org/html/en/reference/calculus/sage/calculus/wester.html
R = PolynomialRing(QQ,5,names='a')
S.x = PolynomialRing(R)
p = S(list(R.gens()))*x
print p = ,p.substitute(a0=17,a1=3,a2=4,a3=6,a4=8)
+ 1 with fidelcc
maybe I will add SR (Symbolic Ring) after matrix(
reference for integrating :
http://tutorial.math.lamar.edu/Classes/DE/LA_Matrix.aspx
or you can try writing some tricky code, writing a symbolic matrix using
linear decomposition like that :
M = x^0 M0 + x^1 M1 +...
and the
When working with nxn matrix, writing a scalar (= a number if you name
numbers matrix elements) like 'a' is the same than writing 'aI' where I
is identity matrix with 1 in diagonal and 0 for other elements) or writing
the diagonal matrix with a in diagonal and 0 for other elements)
addition M
Did you :
- Check file size after downloading ?
- Download file again ?
- Try another mirror (website you downloaded from) ?
- http://spin.atomicobject.com/2013/06/03/ovf-virtual-machine/
Use tool to convert it to ova ?
I know *.ova *file (see : http://ftp.iitm.ac.in/sage/win/ ) but i dont
Check too :
1. enough disk space
2; enough memory
...because some archive softwares use a lot (for example: Linux/Unix
operating system use /tmp)
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Thanks Ralf...yes much better
Adding first line...
n = var('n')
assume(n,'integer')
#solve(n^2-3,n)
#solve(n^2 + 2*n + 1,n)
solve((n-1)*(n^2+1),n)
..and I have very happy to get only integer roots.
But dreamingly, I would like SAGE display (at least) error deprecated
(more precisely not
Precisely I cannot explain it...because using software is not same coding
software ..people , not me, are coding SAGE (and other modules included
into it)
Usually : assume() is Python call for assuming something, and if not
true..then software stops
But here, it's a constraint...it's a
Try again...
Like n-3, 2^n+4.
is NOT a problem
One mathematical example of problem is :
Compute integer sum S = 1+2+3+4+5
For some SYMBOLIC problems for example
Given n natural (n is symbolic = can have any integer positive value),
compute
You're welcome Francois
Bienvenue Francois.
Maybe you can complete the thread...no worry... Volker or William will
fix that later ...:-)
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Read..
http://en.wikipedia.org/wiki/Mathematical_induction
Variants
Induction basis other than 0 or 1
1. Showing that the statement holds when *n* = *b*.
2. Showing that if the statement holds for *n* = *m* ≥ *b* then the same
statement also holds for *n* = *m* + 1
and filling the
Hello Chris;
Thank you... you understood me :-)
Sometimes I want to remind what is written on the main sage-support...
*Guidelines*: 1. only one question per post | 2. descriptive subject title
| 3. also describe the desired result and the context of the problem.
*Include*: Platform (CPU)
Bonsoir Francois,
Je ne peux rien dire de certain pour une version sagemath installé en local
(car je n'ai rien sur mon PC)...mais sur le cloud de SAGE cela fonctionne.
URL site web : https://cloud.sagemath.com
Dans un projet ouvrir un terminal puis exécuter les commandes en fin de
ce post
Le
Hello Chris,
Be nice:
1. post a full short example...delta is not defined
2. worksheet in SAGE cloud ? worksheet of your own computer, sagemath local
install ?
Dominique
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A console is HMI for UNIX or linux computer ... long time ago, the
console was software handling what you type at keyboard and displaying on
a screen the result.
Nowadays computers handle many users and there are more than one window
displayed on physical screen : software handling requests
Bonsoir Ines,
Nous n'avons pas la même traduction de ce qu'a indiqué Franco. Lire son
avant-dernier post:
Yes, the server is now back up and running. Make backups of all your files.
No official decision has been made yet, but *this server will almost
certainly be retired soon* (with
to my face ...
Just now (saturday morning 9 am France), my math reference website
http://mathworld.wolfram.com.webstatsdomain.org/
is down
... and now I am zombie-walking
..until some Leo would be nice to replace URL translation in the DNS, to a
website sorry for inconvenience, ..., comp
Bravo Ines... :-)
A good lesson for you and others.
Yes William, I used strong words because I wanted a quick move ...
The idea was to adress many careless users of the new (2.x) technology :
with clouds, users seem have access to unstoppable, powerful (and free for
some time,.. ) tools.
Ouf,
Merci..a vous pour avoir compris qu'il faut etre rapide... et surtout et a
Franco.
Attendons un peu avant de crier victoire
En tout cas, l'informaticien que je suis, va vous rappeler les bases :
FAITES DES SAUVEGARDES VOUS-MEME ET REGULIEREMENT
Les fichiers SAGE sont en gros des
Hello,
I think you have to phone QUICKLY to many people at Licam
To get information about computer management (as I posted before).
And if you have the opportunity, visit them in Montreal.
At least you will know other student using that comp too.
If you don't...you will know lately that
Bonjour Ines,
j'ai de la famille a Montreal et une belle-soeur a l'UQAM je crois ..mais
cela ne va pas t'aider donc ...
comme l'a dit Vincent, il faut que tu contactes ceux qui gèrent le serveur,
et si tu ne les connait pas, ceux qui t'ont donné les accès.
Le site
Bonjour Ines,
Precisez SVP l'adresse du site internet que vous utilisez ?
Est-ce que c'est bien : https://cloud.sagemath.com/ ?
Si oui, il se peut que votre souci, soit simplement une erreur de
configuration de votre PC, ou des équipements réseau proche de là où vous
êtes (Tunis ?)
En
+1
it looks like parameter density is useful to control how sparse is the
matrix (density of zero elements)
at least, we can use density parameter with value greater than 1...to get
(maybe :-) ) matrix with no zero
random_matrix(ZZ, 5, 5, distribution=uniform,density=1.5)
print
I bet I know why : we can trick mathematical sofware in various
ways,...,but why should we ?
find_root is numerical function to get approximate real root of function
in intervalwhen we know ( theorically) the root exists !!
the function can be implemented in various ways, and for example,
What can be done ?
It depends of what you are looking for. : why you have to solve x tan x =
0 ?
A human will handle factorization and get the answer : x = 0 or tan x =
0...and you can continue yourself wthout computer, no ?
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Solving symbolic equation, like this ...
f,m,a=var(f m a)
res = solve([f == m*a],m)
m = res[0].right(); print m
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Hallo Tobias,
I had the same issue...and I chose to load OR to preparse my included
files.
In main worksheet, first cell contains:
# Load modules
#%hide
import sys
sys.path.append('./modules')
import DrawingConstants as dc
# Import SAGE modules (sage and not python, because file must be
Maybe my answer is off-topic...
If you want an animation which is basically a display of different plots,
why not doing like in W.Stein youtube video :
https://www.youtube.com/watch?v=lhirRHCW1q0
Just stop near 0:30 and you can read code : a function computing a plot and
saving it to a png
Or, if you question is more sage than math question...
...using sympy from the SAGE-wiki help and website
http://byumcl.bitbucket.org/bootcamp2013/labs/sympy.html :
example with no x symbolic and another one with symbolic x
import sympy as sym
from sympy import Symbol
x = sympy.Symbol(x)
y =
Hello guy,
Your question looks like a modeling math problem, ...and is not related
to SAGE.
I wouln't try to solve quadratic problem using linear solvers : LP
means Linear Programming
for definition of LP, read
http://www.sagemath.org/doc/reference/numerical/sage/numerical/mip.html
more
Try relative path in load argument: try A1 = load(./Desktop/abc.txt)
with a dot just fefore first slash
PS : I don't use load() but import or preparse in my SAGE cells, for Python
souce
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Hello,
I have not the ggplot package installed in my SAGE cloud projects (as given
by SAGE cloud wiki,needs network access or upload package)...but...
Can you try with %python at first line in cell ?
The idea is to disable the SAGE cloud pre-parser (in short about it :
overloading of some
Naive reply : why not use imread and imwrite MATLAB func,for the graph
image file ? ( I didn't try)
http://www.mathworks.com/help/matlab/ref/imwrite.html
example : Write a 50-by-50 array, A, of grayscale values to a PGN file
Dominique
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sorry ..: cell (not shell)
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I am not convinced by content of file
/usr/local/sage/sage-6.3.beta6/src/sage/graphs/mcqd.pxd
...but I am *newbie* in python and cython and interface between languages .
mcqd.pxd is not part of the patch package (trac), but from the cloud
Dominique.
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I forget to mention...
1/ my answer is about SAGE cloud
2/ I am not convinced because I cannot read definition of exported function
mcqd
Dominique
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Whar is not working...in sage worksheet cell :
g = graphs.PetersenGraph()
g.clique_number(algorithm=mcqd)
Dominique
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Not directly related to your question...but for others...how to modify path
and how to load python file
Alternative answer to question given in the SAGE cloud wiki-FAQ
https://github.com/sagemath/cloud/wiki/FAQ
*Question: I would like that all of my worksheets know where to find a
given
+1 : not working for me too...file content is displayed in my web browser
(not downloaded)
URL displayed in my browser (Firefox 12.0) is :
https://cloud.sagemath.com/myproject/raw/mydirectory/myfile
where myproject is my project
mydirectory is folder I created under my project
Hello Chris,
seems there are two pitfalls : one when not specifying ivar parameters for
desolve function call or using formal function f in the argument equation.
You can try code like thisShorter code is valid too when expanding
directly eq parameter (as done in SAGE help examples)..
#
8 minutes (19:20)
Good question Edna.!!...:-)
I had the same question many months ago, when I was entertained by the
15-theorem and one Bhargava's paper.
I have not skipped the subject forever... just interested now about
geometry.
You can be sure I would be very interested to know a
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