Comment #4 on issue 1421 by Vinzent.Steinberg: QRdecomposition fails for
some matrices
http://code.google.com/p/sympy/issues/detail?id=1421
Yep, probably you are right.
Currently sympy does exact linear algebra (if you use Rational()), so
QRsolve is
mainly of educational interest. :)
If I
Updates:
Status: Verified
Comment #7 on issue 1419 by plaes800: integrate(x/(x**2-9), x) gives wrong
answers
http://code.google.com/p/sympy/issues/detail?id=1419
Fixed in ce61f8d057e46b36dc2cd879891e74a7f9320201 by Mateusz including
following testcase:
def test_ratint_logpart():
Comment #5 on issue 1421 by Vinzent.Steinberg: QRdecomposition fails for
some matrices
http://code.google.com/p/sympy/issues/detail?id=1421
Yep, probably you are right.
Currently sympy does exact linear algebra (if you use Rational()), so
QRsolve is
mainly of educational interest. :)
If I
Updates:
Status: Verified
Comment #2 on issue 1416 by plaes800: integrate((x**3 - x)/ (x - 1), x)
gives traceback
http://code.google.com/p/sympy/issues/detail?id=1416
Commited as ce61f8d057e46b36dc2cd879891e74a7f9320201 by Mateusz
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Updates:
Status: Accepted
Owner: plaes800
Labels: Solvers
Comment #1 on issue 1406 by plaes800: solve solves b*a**x-y, y-b*a**x, or
y-a**x for x but not a**x-y
http://code.google.com/p/sympy/issues/detail?id=1406
This has been fixed already, just needs testcase before
Comment #8 on issue 1420 by 2006.Uchida: subs() seems to fail against
D(x(t), t)
http://code.google.com/p/sympy/issues/detail?id=1420
Can I ask you a question here?
I made some codes which allows you to create motion equations of dynamics
in sympy.
Where can I share my a little work with
Comment #9 on issue 1420 by ondrej.certik: subs() seems to fail against
D(x(t), t)
http://code.google.com/p/sympy/issues/detail?id=1420
Please send an email to:
http://groups.google.com/group/sympy
also checkout pydy:
http://code.google.com/p/pydy/
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Updates:
Status: PassedReview
Comment #14 on issue 1188 by ondrej.certik: integrate(1/sin(x)**2,x) fails
http://code.google.com/p/sympy/issues/detail?id=1188
I think this patch is ok. I'll push it in soon.
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Hello, thanks for the patch!
Just a comment, see below:
On Wednesday 13 May 2009 19:54:18 Jochen Voss wrote:
The new method is slower than Matrix.LUsolve, but should be more stable.
The commit also fixes a closeby comment and adds a new docstring.
This fixes issue #907 from the issue
Hi Riccardo,
2009/5/14 Riccardo Gori goricca...@gmail.com:
+ # back substitution to solve R*x = y:
+ # We build up the result backwards in the vector 'x' and reverse
it + # only in the end.
+ x = []
+ n = R.lines
+ for j in range(n-1, -1, -1):
+ tmp = y[j,:]
Why do you use y[j,:]
Issue #1406 has been fixed in tree meanwhile (probably thanks to
Mateusz) so lets just add a testcase for future.
Can be seen at:
https://code.plaes.org/git/sympy.git/commit/?id=b33806aa5e5e6cc14320dfe991f82cec2c70ad4b
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Hi,
On Thu, May 14, 2009 at 06:37:15PM +0300, Priit Laes wrote:
Renames Basic.is_fraction to Basic.is_rational_function and adds a
docstring with doctests.
Can be viewed here:
https://code.plaes.org/git/sympy.git/commit/?h=patches-0514id=5d27fd77f72bc3887fae02ad568b00838227e3b8
or as an
Bernoulli ODE has one case where it should be solved using different
algorithm. Currently we don't detect it and hilarity ensues in the form
of divide by zero :)
https://code.plaes.org/git/sympy.git/commit/?h=patches-0514id=56524bf458074ac9635f537ef6f83c4727ea7a56
I thought I already sent in a patch to fix this.
Aaron Meurer
Sent from my iPod Touch.
On May 14, 2009, at 9:53 AM, Priit Laes plaes...@gmail.com wrote:
Bernoulli ODE has one case where it should be solved using different
algorithm. Currently we don't detect it and hilarity ensues in the
Specially annoying was the fact that you could not return list
or tuples.
I don't know the reason of this behaviour, fortunately
changing it did not break any tests.
---
sympy/core/function.py | 17 ++---
sympy/core/tests/test_functions.py |7 +++
2 files
2009/5/14 Priit Laes plaes...@gmail.com
Spotted some low-hanging fruit in ODE solver and tests
https://code.plaes.org/git/sympy.git/commit/?id=db94caf3f64b7bfa4dd40266c0eeafc774f7233d
x, C1 = map(Symbol, ['x', 'C1'])
Please note that you can use
x, C1 = symbols('x C1')
Vinzent
Hi,
I'll be travelling for a few days and will be able to send a new patch
only sometimes next week. What I suggest to do is:
1) Remove the more stable wording from the QRsolve docstring.
2) Add warnings to the both the LUsolve and the QRsolve docstrings,
stating that these functions should
Can this be passed in now? I didn't see any more comments on the
issues page.
On Mar 30, 11:08 am, Ondrej Certik ond...@certik.cz wrote:
Thanks!
On Sun, Mar 29, 2009 at 11:01 PM,AkshaySrinivasan
akshaysriniva...@gmail.com wrote:
This patch adds support for the integration of functions of
Hello,
just FYI, there are already random number objects in sympy,
you can access them this way:
from sympy.statistics import *
x = Normal(0,1)
x.random()
-0.181742214115
a = x.random(10)
print a
Sample([-1.47958009923, -1.23521203179, -0.783418473091,
-0.0760736376295, -0.0466694687666,
Ondrej Certik wrote:
On Mon, May 11, 2009 at 9:23 PM, Luke hazelnu...@gmail.com wrote:
Would there be any reason that the following should not be implemented:
t = Symbol('t')
q1 = Function('q1')(t)
solve(q1 - 1, q1)
Currently, the solve function gives:
Which is the best python group/list to make the suggestion to that in
future versions of python operator precedence for overloaded operators
in classes should be programmable?
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Grissiom wrote:
Right. So if we patch sympy with the patch above, it will stop working
on Debian/Ubuntu and maybe other distros.
One option is to just ship the rst2html.py wrapper with sympy, if you
look into it, essentially what it is doing is just:
from docutils.core import
Ühel kenal päeval, N, 2009-05-14 kell 07:11, kirjutas Alan Bromborsky:
I am afraid that is not the only problem for windows. There are lots of
little things like no 'rm' utility. I also tried to make the
documentation (make html) under Cywin and have gotten nowhere!
How about ask for
On Thu, May 14, 2009 at 05:58:08PM +0300, Priit Laes wrote:
Ühel kenal päeval, N, 2009-05-14 kell 07:11, kirjutas Alan Bromborsky:
I am afraid that is not the only problem for windows. There are lots of
little things like no 'rm' utility. I also tried to make the
documentation (make
On Thu, May 14, 2009 at 06:09, Alan Bromborsky abro...@verizon.net wrote:
Which is the best python group/list to make the suggestion to that in
future versions of python operator precedence for overloaded operators
in classes should be programmable?
As I've told you before, you can't make
On Thu, May 14, 2009 at 3:12 AM, Fabian Pedregosa fab...@fseoane.net wrote:
Maybe the distinction between Symbol and Function in SymPy is rather
artificial. After all, a function is an unknown variable with the same
operations as Symbol, being the only difference with symbol that they
live in
Ondrej Certik wrote:
On Thu, May 14, 2009 at 3:12 AM, Fabian Pedregosa fab...@fseoane.net wrote:
Maybe the distinction between Symbol and Function in SymPy is rather
artificial. After all, a function is an unknown variable with the same
operations as Symbol, being the only difference with
dennis.rose...@gmail.com wrote:
I am teaching a course for using a variety of software for
mathematics, and I am teaching a bit of Python.
I just downloaded sympy-0.6.4, but have never used it before.
(I have done other Python programming)
I had planned to present something on sympy but
Hi,
for testing that my FEM calculation of the radial Schroedinger
equation is correct, I test the claculated eigenvalues. One example is
a 3D spherical well, the energies of which are zeros of the spherical
bessel function. Here is how to calculate in sympy (resp. mpmath):
from sympy.mpmath
On Thu, May 14, 2009 at 3:19 PM, Fabian Pedregosa fab...@fseoane.net wrote:
Ondrej Certik wrote:
On Thu, May 14, 2009 at 3:12 AM, Fabian Pedregosa fab...@fseoane.net wrote:
Maybe the distinction between Symbol and Function in SymPy is rather
artificial. After all, a function is an unknown
On Thu, May 14, 2009 at 3:22 PM, Fabian Pedregosa fab...@fseoane.net wrote:
dennis.rose...@gmail.com wrote:
I am teaching a course for using a variety of software for
mathematics, and I am teaching a bit of Python.
I just downloaded sympy-0.6.4, but have never used it before.
(I have done
On Thu, May 14, 2009 at 4:10 PM, Ondrej Certik ond...@certik.cz wrote:
On Thu, May 14, 2009 at 3:53 PM, Gael Varoquaux
gael.varoqu...@normalesup.org wrote:
On Thu, May 14, 2009 at 03:47:59PM -0700, Ondrej Certik wrote:
Hi,
for testing that my FEM calculation of the radial Schroedinger
I know sympy has random variables, and so does sage, but they cannot
be manipulated (+-*/ exp, integrate...) and so their uses are limited;
and I couldn't find anything like that in the googlable literature.
Let's put it this way: A student may want to check his answers in his
statistics exam
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