sympy Google Group

Re: diff(diff)

2010-01-06T04:03:41Z

Thanks Aaron,
To my needs,
import sympy
import math
diff(sympy.sin(x)*diff(u(x),x) ,x)
is a good choice because math functions are used in other places.
I will try this.
czbebe

Re: [sympy] diff(diff)

2010-01-06T03:11:43Z

I believe the problem lies here. You are importing math, which imports the math sin, which doesn't work with SymPy symbolic operations. You have some options:
- Don't import math. If you need to evaluate a floating point expression, use N() or .evalf(), as in sin(1.2).evalf(). If you need other things from math, do explicit imports instead of import *. Actually, it's best to use explicit imports anyway, especially if you are writing a script.

diff(diff)

2010-01-06T02:32:58Z

Dear members,
import sympy
import math
u = Function('u')
x = Symbol('x')
diff(diff(u(x),x),x) = D(u(x), x, x) ii is all right.
diff(x*diff(u(x),x),x) = x*D(u(x), x, x)+D(u(x), x) it is all right.
diff(sin(x)*diff(u(x),x),x) gives an error.
Can anyone show me the correct way to get a correct result ?

Re: diff f(x)

2010-01-04T09:36:44Z

Thank you for your reply.
I suceeded to run the code.
D(f(x), x)
How about second derivatives ?
I mean
diff(D(f(x), x),x)
Is there any way to get the answer ?
Thanks in advance,
czbebe

Re: diff f(x)

2009-12-28T14:11:08Z

On Dec 28, 12:04 pm, "czbebe_...@yahoo.co.jp" <czbebe_...@yahoo.co.jp>
wrote:
I get the following:
D(f(x), x)
Did you use f(x) or did you use f? Could you copy and paste the exact
input and output involved? That would me to understand what exactly
you are trying to do.
/smichr

diff f(x)

2009-12-28T07:04:18Z

Dear members,
When function f is a function of x, sympy diff output is diff(f,x) =
0.
I hope output should be dx(f). Is this output possible for current
sympy ?
czbebe

Re: [sympy] Re: [Ann] SymPy 0.6.6 released

2009-12-26T21:32:55Z

I made this:
[link]
I just uploaded sympy-0.6.6 into Debian, so maybe it will get there
automatically (as into Ubuntu).
Done. I also updated live.sympy.org and pypi and freshmeat.
Thanks everyone for this release and especially Vinzent for managing it!
Ondrej

Re: [sympy] Re: removing the old assumption system - help request

2009-12-23T19:51:11Z

Yes, you should definitely meet and work together. It's very effective.
Ondrej

Re: [sympy] a patch to examples/intermediate/mplot3d.py

2009-12-23T19:49:41Z

[link]
Ondrej

Re: [sympy] Re: removing the old assumption system - help request

2009-12-22T10:11:39Z

Le mardi 22 décembre 2009 à 01:29 -0700, fab...@fseoane.net a écrit :
I would say that directly swapping out the old assumption system for the
new has failed, and that we therefore need to duplicate with the new one
everything the old one does.
With the holiday season, I won't be able to do much in the next 2 weeks.

Re: [sympy] Re: removing the old assumption system - help request

2009-12-22T08:29:52Z

On Mon, 21 Dec 2009 23:04:08 -0700, "Aaron S. Meurer" <asmeu...@gmail.com>
wrote:
work.
I am glad there is interest in this. I've been busy lately moving to Paris,
but now I am settled so I'll get some time to work on this.
If anyone has patches on this, please give me your git repo and I'll review

Re: [sympy] Re: removing the old assumption system - help request

2009-12-22T06:04:08Z

So now that 0.6.6 is released, I think we should make this top priority. The thing Chris and I are discussing on IRC is what is the best way to collaborate on this with git so that we don't duplicate each other's work. Also, can anyone give a clear list of what needs to be done? Does anyone other than Fabian really know this?

Re: [sympy] [Ann] SymPy 0.6.6 released

2009-12-21T20:04:00Z

Also, the docs at [link] need to be updated.
Aaron Meurer

Re: [sympy] [Ann] SymPy 0.6.6 released

2009-12-21T18:06:09Z

Great! What needs to be done for this to be pushed up to fink and the other package managers? According to fink, the fink package maintainer for sympy is Lev Givon <l...@columbia.edu>.
Aaron Meurer

Re: [sympy] Re: [Ann] SymPy 0.6.6 released

2009-12-21T17:57:32Z

Not only are they installed, but they don't even work:
Aaron-Meurer:~ aaronmeurer$doctest
Traceback (most recent call last):
File "/Library/Frameworks/Python.fr amework/Versions/2.6/bin/docte st", line 17, in <module>
from get_sympy import path_hack
ImportError: No module named get_sympy
Aaron-Meurer:~ aaronmeurer$cd /Library/Frameworks/Python.fra mework/Versions/2.6/bin/