'is_Pow'
Aaron Meurer
On Dec 8, 2009, at 5:51 AM, Christophe BAL wrote:
Hello,
I would like to use sympy in the following way :
1. The user types some formula like for example 2*x**3+5.
2. My little program named test.py must have to differentiate this
formula.
The problem
Hello,
is it possible to know the formulas used by sympy when simplications are
done using for example trigsimp ?
Christophe.
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used the formula sin(x)**2 + cos(x)**2 = 1 . Is it possible
or not ?
Christophe.
2009/12/15 Ondrej Certik ond...@certik.cz
On Mon, Dec 14, 2009 at 3:11 PM, Christophe BAL projet...@gmail.com
wrote:
Hello,
is it possible to know the formulas used by sympy when simplications are
done
I suspect that it will be possible in future versions to ascertain how a
piece
of algebraic manipulation was performed -- indeed, it would be a
requirement
for Wolfram Alpha style step-by-step solutions to specific classes of
problem.
From what I understand about the algorithm Luke is
Hello,
a little remark.
Some people wants sympy to do some step by step calculations. I don't
think that is the job of a CAS because firstly the steps depend on the level
and the way of the exercises, and secundly the way a CAS works is not the
way a human calculates.
For my part, I will build a
Maybe that there is a way to also incorporate this in sympy somehow,
and if it is, I am all for it.
For a lot of reasons, I've needed to build my own formula parser. I've a
tree structure with objects, each having a tag to know if it is simplified
or not.
For example, x^2+15/25 will be see
Hello,
I think that S is usefull but mystic for new user.
Instead of sympify, you could propose the name cvToSympy alias convert to
sympy. It's longer but easier to understand.
Best regards.
Christophe
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Rather than using sympify whioch is reallly close to simplify, why don't you
use sympyfy ? I really think that is clearer.
Chrisotphe
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Hello,
sympyit looks very good. It sounns like to sympy something.
Best regards.
Christophe
2010/12/9 Chris Smith smi...@gmail.com
Filip Dominec wrote:
Alternatively we may leave sympify untouched and use 'simple()'
instead of 'simplify()'. I write this function quite often and every
Hello.
SymPy is quite close to replace Mathematica for most basic things.
Some features are still missing though, so I will try to implement
those, but I wanted to discuss my plan here too, in case you would
have some suggestions, comments:
I think that the better way to do that would be to
Hello.
You're right.
Christophe.
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Hello,
there are versions of Numpy for Python 3.1.
Is there a version of sympy for at least Python 3.1 ?
Christophe
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Hello.
2011/2/27 James Pearson
As a note, Python 3.2 just dropped, so I'd target that if you want a
specific 3.x version.
The better would be to have a Python 3.2 version. It seems that the Python
2... series will not have new features.
I hope that in september at least a beta version for
Hello.
trigonometric functions in exp/ln expressions with Eulero formulas:
$cos(x)=\frac{e^{ix}+e^{-ix}}{2}$
$sin(x)=\frac{e^{ix}-e^{-ix}}{2i}$
with 'i' imaginary unit, and 'x' a real value (if I'm right, 'x' must
be real).
No. For every complex number z, we have cos z = (exp(iz) +
free to correct it, and adapt and port it
to sympy.
Christophe BAL
=== My code - START ===
#!/usr/bin/env python
#coding=utf-8
# Code writing by BAL Christophe
# Mail : pyban...@gmail.com
def endPointsToUser(europeanEndpoints, notation):
# Lines automatically built by tool_simpleSets.py
Hello.
That's look very good. This would also allow to build customized math tree
from sympy tree.
C.
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Hello, I have a little suggestion.
This is similary to Number(2) or Real(2) returning
Integer(2) and Integer(1) returning S.One.
So now Polygon((1,1)) returns Point(1,1) rather
than raising an error.
* The only potential problem is that whereas Polygon
has an area, Line and point do not.*
Thanks.
Christophe.
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Hello,
I've just tried the following code in Sage :
==
x = var('x')
solve(exp(x)-exp(x**2),x)
==
The output is :
[e^(x^2) == e^x]
Why the exp are not cancelled ? Here there is no problem contrary to the
case of an equation like
Hello,
you're right.
But it could be usefull to havethe cancellation in case of real equation.
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Hello.
On the other hand, maybe solve should be able to tell
that f(x) - f(y) == 0 implies the solution x == y
(but there may be more solutions unless f is one-to-one).
Ir could be a nice feature to have the possibility to declare a function to
be one-to-one so as to solve the very simple
Hello.
I don't know if this will hepl you but I've been in trouble when I've tried
to pickle class using lambda functions in one attribut.
Best regards.
Christophe.
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Hello,
you could put this in teh wiki.
C.
2011/7/5 Saptarshi Mandal sapta.iit...@gmail.com
Hi all,
A few days back I implemented a bunch of combinatorial generation
algorithms for rather specialized objects (necklaces, lyndon words,
bell permutations). These were being reviewed by Chris
Hello,
pySide or pyQt works well on Linux, Windows and Mac.
C.
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Hello,
what are the main differences with the current plotting system ? Are there
some visual examples ?
Best regards.
C.
2011/10/26 krastanov.ste...@gmail.com krastanov.ste...@gmail.com
Hi,
Some time ago I announced that I was playing with some code for a new, more
general plotting
Hello,
I'm also working for one grammar tool so as to easily define highlight
rules, I do not like the way pygments works from develppers' point of view,
and also so as to process some simple syntax analysis.
So as to acheive this I need one semantic grammar tool. Do you know if
there is such
Hello,
what are the algorithms used to calculate approximation of exp ?
Best regards.
Christophe.
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Thanks.
Christophe
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Hello,
I don't think that's so great to make [5, 4] the empty set because one
interval can also be seen like one convex hull : [a;b] = {k a + (1 - k)b |
0 = k = 1} .
Best regards.
Christophe.
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Hello Voncent,
is it possible to use your code ?
Christophe
2011/12/22 Vincent MAILLE htcvi...@gmail.com
Hello. Thanks for your answer.
Issue 1966 would be fine indeed (I clicked +1). Regarding intervals, I use
them afterwards to display the definition domain of the function, but first
I
Thanks for this christmas gift ! [?]
C.
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Hello,
try the following.
Best regards.
Christophe.
===
#!/usr/bin/env python2
from sympy import *
# Une equation toute simple
var('a b c')
a = 10
b = 20
print solve(a * 12 + 50*c - (456 + b), c)
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Hello.
So Float objects should always compare unequal to Rational objects,
for example Float(3.0) == Rational(3) should be false?
This seems normal because Float(3.0) indicates one approximative number.
But on the other Decimal(3.0) == Rational(3) should be true.
Best regards.
Christophe
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Hello.
Hm. Mathematically, they should be the same.
Mathematically, the float numbers don't exist ! A float number is not a
decimal one.
Best regards.
Christophe
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What is the implementation of floats ? Is it the traditional one with
maximum sizes for the mantisse and the exponent ?
If it is, it is not true that float are decimal or even base-2 numbers.
Why, because a fixed size of the mantisse implies some approximations.
This is not the same
In that case, zoo*zoo is zoo. No ?
Christophe BAL
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Hello,
as a user, I would like to always have one list, the list [] when there is
no solution. This allows to simply iterate over each solution and then acts
on it, where as for the moment I must take care of the type of the answer.
Not very simple, isn't it ?
Christophe.
2012/6/2
One solution could be to use one customized list class with the following
feature.
1. print([]) --- None
2. print([x]) --- x
3. print([a,b,c]) --- [a,b,c]
This allows to always have the same kind of object from Python view, and to
keep one explorary mode from one console point of view.
You said that for a geometer the results should be real (for example).
That's not true. In the plane, one geometer can use complex numbers, and in
space the use of quaternions can be very usefull.
Best regards.
Christophe.
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Hello,
I would like to know if there some usefull pieces of code to look in so as
to learn how to add new functionalities to SymPy.
Best regards.
Christophe
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Hello,
expansion((x+y)**0.2) should raise one error.
Christophe
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don't have one concrete example, but there are situations where the
approximation of a/b
will give one float, an then one decimal that when it is reconverted to one
ration al p/q, this
fraction verifies p/q a/b.
Christophe BAL
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Hello,
I think that it would be very useful to develop one standalone project
about step-by-step output. This project will use sympy for hard calculation
and maybe other project if necessary.
I say that because most of symbolic calculations are far away from the
human reasoning.
Christophe BAL
Be carefull because some problems are hard to solve in their general forms.
I'm thinking about SAT-problem which is known to be NP-complete : see this
page http://en.wikipedia.org/wiki/Boolean_satisfiability_problem.
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g = gcd(L[0] ; L[1]). If the result is 1 then nothing else
has to be done.
2) If L is empty, g is the gcd, else remove L[0] and L[1] and go to
1).
Christophe BAL
2013/7/11 Mateusz Paprocki matt...@gmail.com
Hi,
On 11 July 2013 11:14, Thilina Rathnayake thilina.r...@gmail.com wrote
Hello,
I'v just tried to type asin(0.5) which gives 0.523598775598299 . It
could be usefull to take care of the classical values of acos x and asin
x for x = pi/6 , pi/4 and pi/3 .
Best regards.
Christophe
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putting in exact fractions:
In [1]: asin(S(1)/2)
Out[1]:
π
─
6
Best,
Tom
On 06.09.2013 00:05, Christophe Bal wrote:
Hello,
I'v just tried to type asin(0.5) which gives 0.523598775598299 . It
could be usefull to take care of the classical values of acos x and
asin x for x
The fact that I''ve focused in my first message is that in asin(1/2) the
argument 1/2 is a float whereas in 1/2 + 7/3 it is seen has a fraction.
That shows a weakness of asin regarding to the addition. Don't you think
the same ?
Le 6 sept. 2013 18:26, Sergey B Kirpichev
Indeed I've used Sympy Live.
Le 6 sept. 2013 23:27, Ondřej Čertík ondrej.cer...@gmail.com a écrit :
On Fri, Sep 6, 2013 at 3:19 PM, Christophe Bal projet...@gmail.com
wrote:
The fact that I''ve focused in my first message is that in asin(1/2)
the
argument 1/2 is a float whereas in 1/2
, Sep 6, 2013 at 3:36 PM, Christophe Bal projet...@gmail.com
wrote:
Indeed I've used Sympy Live.
Le 6 sept. 2013 23:27, Ondřej Čertík ondrej.cer...@gmail.com a
écrit :
On Fri, Sep 6, 2013 at 3:19 PM, Christophe Bal projet...@gmail.com
wrote:
The fact that I''ve focused in my first
Hello,
is there a little history of the birth and the evolution of Sympy ? I'm
interesting by the human adventure.
Christophe
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Thanks for this !
Christophe
Le 8 sept. 2013 13:55, Thilina Rathnayake thilina.r...@gmail.com a
écrit :
Hi,
See if these links can help.
http://docs.sympy.org/0.7.3/aboutus.html
http://ondrejcertik.blogspot.com/
Regards,
Thilina
On Sun, Sep 8, 2013 at 1:50 PM, Christophe Bal projet
Thanks.
Christophe
Le 8 sept. 2013 19:18, Ondřej Čertík ondrej.cer...@gmail.com a écrit :
On Sun, Sep 8, 2013 at 11:18 AM, Ondřej Čertík ondrej.cer...@gmail.com
wrote:
On Sun, Sep 8, 2013 at 5:55 AM, Thilina Rathnayake
thilina.r...@gmail.com wrote:
Hi,
See if these links can help.
side of things.
Aaron Meurer
On Sun, Sep 8, 2013 at 11:55 AM, Christophe Bal projet...@gmail.com
wrote:
Thanks.
Christophe
Le 8 sept. 2013 19:18, Ondřej Čertík ondrej.cer...@gmail.com a
écrit :
On Sun, Sep 8, 2013 at 11:18 AM, Ondřej Čertík
ondrej.cer...@gmail.com
wrote
Symbolic calculs is not human one...
Your question is quiet interesting to see how the Sympy experts could help
you.
Le 8 oct. 2013 19:39, Taylan Şengül taylansen...@gmail.com a écrit :
Hi all,
I am quite new to sympy.
When I type the following
a = symbols('a')
m = Matrix( [ [a, 0], [0,
Hello,
sorry for this little out of scope question.
What is used internally so as to build x with vars('x') ?
Christophe
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Thanks for this totally in the scope of my question... ;-)
Christophe
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Hello,
is there a function in Sympy to convert an integer given in some B-base
writing to another b-base writing ?
Christophe
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, called digits. See also
http://stackoverflow.com/a/2267446/161801.
Aaron Meurer
On Fri, Nov 1, 2013 at 2:06 PM, Christophe Bal projet...@gmail.com
wrote:
Hello,
is there a function in Sympy to convert an integer given in some B-base
writing to another b-base writing ?
Christophe
Thanks, you should add this in the documentation. I've not seen it anywhere.
2013/11/5 Aaron Meurer asmeu...@gmail.com
Use the factor_list function.
Aaron Meurer
On Tue, Nov 5, 2013 at 12:19 PM, Christophe Bal projet...@gmail.com
wrote:
I could achieve this playing with factor().args
been used ?...
Best regards.
Christophe BAL
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Hello,
for pefagogic
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Hello,
for pédagogical reasons, I would like to show human like calculations on
real numbers first.
Which advices would you give for such a project ?
C
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Great, I wanted just to ask if I can have the formula as it was typed just
before any evaluation. So my idea will be to walk in the initial formula so
as to do the calculation needed more or less directly.
Thanks for all.
Christophe BAL
2013/11/9 Aaron Meurer asmeu...@gmail.com
sympify
So I need to play with github or not ?
2013/11/11 Aaron Meurer asmeu...@gmail.com
Only the development version. The branch was only merged about a week ago.
Aaron Meurer
On Sun, Nov 10, 2013 at 3:45 PM, Christophe Bal projet...@gmail.com
wrote:
Hello,
which version has this ?
Best
Hello,
following the advice of Aaron, here is a more generic way to do that.
*=== CODE ===*
*from sympy import **
*variables = [*
*x for x, _ in zip(*
*numbered_symbols(prefix = 'x', start = 1), *
*range(1,4)*
*)*
*]*
*functions = [*
*f for f, _ in zip(*
*
Hello.
What is the difference with à variable and à.constant in fir example the
formula a*x**2 + b*x + c ?
For mathematical point of view, a, b, c and x are.variables.
Christophe
Le 29 déc. 2013 16:26, Roger W raw...@gmail.com a écrit :
I want to develop a procedure in sympy to determine
Hello.
Akshay says :
My idea is to extend the current module which
has only ellipse class to add both Hyperbolae
and Parabolae classes to the Geometry module.
You could work on a class Conic. Using projective geometry, it's easy to
deal with all the different kinds of conics.
Christophe,
That's right but it could be useful to have such a class fir more general
context.
Le 29 janv. 2014 10:05, Akshay akshaynukal...@gmail.com a écrit :
@Christophe
I thought of that but Ellipse and Circle have already been
implemented.Furthermore one class cannot generalise all these conic
Thanks for this.
Christophe.
2014-02-06 Shipra Banga bangashi...@gmail.com:
Sympy runs on a python terminal as of now.
Using kivy I have tried to build a user-friendly interface which makes it
easier for users to type out maths equations using a customized virtual
keyboard for it.
Hello,
Gimp allows to convert this kind of file to a PDF one for example.
This format would be easier to read directly.
Best regards.
2014-02-15 22:47 GMT+01:00 Nitin Agarwal nitinagarwal3...@gmail.com:
xcf file is a GIMP Image file. You can probably use GIMP to open this file.
*Nitin
Hello.
limit((x*exp(x))/(exp(x)-1), x, -oo)
gives
-oo
Is this a bug or am I a bug ?
Best regards.
Christophe
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Thanks for this.
2014-02-17 19:21 GMT+01:00 Avichal Dayal avichal.da...@gmail.com:
However gruntz gives the correct result:-
gruntz((x*exp(x)) / (exp(x)-1), x, -oo) gives 0
The part of code that is going wrong is already labeled as XXX: todo
More specifically the following:-
if abs(z0) is
() is not that much smarter, but it does
have a bad tendency to give wrong answers when gruntz() works just
fine.
Aaron Meurer
On Mon, Feb 17, 2014 at 1:29 PM, Christophe Bal projet...@gmail.com
wrote:
Thanks for this.
2014-02-17 19:21 GMT+01:00 Avichal Dayal avichal.da...@gmail.com:
However gruntz
Thanks.
I've just tried
2014-02-18 13:20 GMT+01:00 Sergey Kirpichev skirpic...@gmail.com:
On Tuesday, February 18, 2014 12:51:50 PM UTC+4, Christophe Bal wrote:
Hello,
what is the origin of this name gruntz ?
From the name of algorithm author.
2014-02-18 1:57 GMT+01:00 Aaron Meurer
Hello,
as a simple user, I think the support of conic and quadratic is also needed
for 2D and 3D geometry.
There is also a need to allow a way to put a 2D context into the 3D one.
Christophe BAL
2014-02-18 20:32 GMT+01:00 Akshay akshaynukal...@gmail.com:
Hello,
The current geometry module
Thanks for this reference.
Christophe
Le 19 févr. 2014 00:39, someone someb...@bluewin.ch a écrit :
Hi,
what is the origin of this name gruntz ?
On Computing Limits in a Symbolic Manipulation System:
ftp://ftp.inf.ethz.ch/doc/dissertations/th11432.ps.gz
A nice text to read.
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Hello.
How will you evaluate thé probability of à language?
Christophe, a simple user.
Le 23 févr. 2014 04:19, Aditya Shah adityasha...@gmail.com a écrit :
I would like to discuss my plan of action to develop the general parsing
framework for Sympy. Right now the code is quite messy. The
Thanks for the explanations.
2014-02-23 14:46 GMT+01:00 Aditya Shah adityasha...@gmail.com:
Hi Sachin,
While I do agree that inclusion of NLP parser would be a big project in
itself. But if implemented even as an add-on, it can be used to augment the
capabilities of Sympy Live.
Btw just a
Hello.
Can you give a little example showing how to define an infix operator in
Haskell ?
Christophe
Le 26 févr. 2014 00:02, Sergey Kirpichev skirpic...@gmail.com a écrit :
On Tuesday, February 25, 2014 8:31:02 PM UTC+4, Aaron Meurer wrote:
Some people on this list might be interested in
parser.
Christophe BAL
Le 26 févr. 2014 01:10, Aaron Meurer asmeu...@gmail.com a écrit :
Previous PEPs have tried this and failed. This PEP is an attempt at a
compromise that suits the community's needs but still has potential to
be accepted by the BDFL.
Aaron Meurer
On Tue, Feb 25, 2014 at 5
Hello.
Is there an equivalent of FullForm that produces simple treeview of a
formula ? Here is basic example seen in a video.
FullForm[x**2+x**3] = Plus[Power[x, 2], Power[y, 3]]
Best regards.
Christophe BAL
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sympy
be treated as a complex. By
giving an integer id for the kind of a number, and by choosing integer_id
rational_id reals_id imaginary_id complexe_id, then the kind of
number could be the maximum of all the id met in an expression.
What do you think about that ?
Christophe BAL
2014-03-04 12:36
Thanks for this two answers.
Christophe
2014-03-04 20:25 GMT+01:00 Mateusz Paprocki matt...@gmail.com:
Hi,
On 3 March 2014 16:30, Christophe Bal projet...@gmail.com wrote:
Hello.
Is there an equivalent of FullForm that produces simple treeview of a
formula ? Here is basic example
Hello.
In your prototype, you have written :
b.arbitrary_point('z') = Point(-13*z +5, -11*z+5, -8z+5)
c=Line(Point(2,3), Point(3,5)) # Here the default value of z is taken as 0
Why don't you work with a symbolic variable z ?
You will also have to take care of point in segment for example.
Sorry for my message, I was drunk... ;-)
2014-03-04 21:32 GMT+01:00 Akshay akshaynukal...@gmail.com:
c=Line(Point(2,3), Point(3,5)) # Here the default value of z is taken as 0
I meant that the z co-ordinate of the point is taken as 0.
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I've a little suggestion about planar object into a 3D scene.
*O = Point(2, 3, 4)*
*I = Point(4, 5, 4)*
J = Point(2, 3, 7)
*line = Line(Point(2,3), Point(3,5)) # z-plane by default*
*line2 = **putin((O, I, J), **line**) # Let's go in another plane*
This allows to easily put a planar scene in
z-plane must be changed to xy-plane. Sorry for this.
2014-03-05 10:26 GMT+01:00 Christophe Bal projet...@gmail.com:
I've a little suggestion about planar object into a 3D scene.
*O = Point(2, 3, 4)*
*I = Point(4, 5, 4)*
J = Point(2, 3, 7)
*line = Line(Point(2,3), Point(3,5)) # z-plane
° that could be
better because it is near from the dot scalar of two vectors. *I do not
think that @ is really intuitive. *
A math user of Sympy, Numpy and Scipy that will note appreciate to use @
for the matrix multiplication.
Christophe BAL
2014-03-09 8:54 GMT+01:00 Joachim Durchholz j
.
On the other hand, we also have to heard that the elementwise multipication
is often used.
The most important thing will be to have a good choice.
Best regards.
Christophe BAL
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Hello,
is there someone on this list that knows a good book reference about the
Karr summation algorithm ?
Christophe BAL
2014-03-10 0:12 GMT+01:00 someone someb...@bluewin.ch:
Hi,
I am Pritam.
I want implement the Karr algorithm for the google summer of code
2014 sympy organisation. I
Hello.
I've just seen that NumPy and matplotlib proposes a dmg installer for
Python 3. This is very usefull.
Is there just one dmg for SymPy ? If not, maybe the setup in the source
codes of NumPy and matplotlib could help to build such a dmg for SymPy.
Best regards.
C.
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Visit
. Hope this helps.
Comer
On Monday, March 10, 2014 3:04:37 AM UTC-4, Christophe Bal wrote:
Hello,
is there someone on this list that knows a good book reference about the
Karr summation algorithm ?
Christophe BAL
2014-03-10 0:12 GMT+01:00 someone some...@bluewin.ch:
Hi,
I am Pritam
+, - and /.
Best regards.
Christophe BAL
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:07 GMT+01:00 Matthew Brett matthew.br...@gmail.com:
Hi,
On Mon, Mar 10, 2014 at 11:59 AM, Aaron Meurer asmeu...@gmail.com wrote:
Can you point to this discussion?
Aaron Meurer
On Mon, Mar 10, 2014 at 4:31 AM, Christophe Bal projet...@gmail.com
wrote:
Hello.
I've just seen
Matthew, could you send me the code you use to build the DMG ?
-
sympy.test() is too simple for a french brain. :-) The tests give only one
warning and one error.
*WARNING*
sympy/core/tests/test_args.py[572]
Thanks 2.
2014-03-10 23:12 GMT+01:00 someone someb...@bluewin.ch:
Hi,
is there someone on this list that knows a good book reference about
the Karr summation algorithm ?
There are about 3 references which are more than a research paper:
1.) Symbolic Summation in Difference Fields
Thanks for this.
2014-03-10 23:39 GMT+01:00 Matthew Brett matthew.br...@gmail.com:
Sorry - I sent the message too early accidentally:
On Mon, Mar 10, 2014 at 3:31 PM, Matthew Brett matthew.br...@gmail.com
wrote:
Hi,
On Mon, Mar 10, 2014 at 3:25 PM, Christophe Bal projet...@gmail.com
Hello,
you can also look at Bokeh http://bokeh.pydata.org/.
Christophe BAL
2014-03-18 8:50 GMT+01:00 SAHIL SHEKHAWAT sahilshekhawa...@gmail.com:
I have been working on a proposal to implement 3D plotting in SymPyGamma,
and Jason pointed me to the importance of d3.js and Three.js backend
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