[sympy] thirdparty packages yes or no?

Hi, what should we do about thirdparty packages? See this issue for rationale: http://code.google.com/p/sympy/issues/detail?id=516 I'd like to hear more opinions. Should we: 1) leave things as they are now (possibly fixing pyglet's imports so that we don't have to touch sys.path) 2) remove all

[sympy] Re: should we allow using implicit imports?

On Tue, May 27, 2008 at 10:53 PM, Ondrej Certik <[EMAIL PROTECTED]> wrote: > Hi, > > I think we should know allow using implicit imports in the sympy code we should not > as I think it only makes debugging harder because you don't know where > the symbols are comming from. > We discussed this on

[sympy] should we allow using implicit imports?

Hi, I think we should know allow using implicit imports in the sympy code as I think it only makes debugging harder because you don't know where the symbols are comming from. We discussed this on the mpmath mailinglist: http://groups.google.com/group/mpmath/msg/d97f4b9e195b77a3 where Fredrik us

[sympy] Re: diff and subs

On Tue, May 27, 2008 at 5:04 PM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote: > > On Tue, May 27, 2008 at 04:28:22PM +0200, Ondrej Certik wrote: >> >> On Tue, May 27, 2008 at 3:56 PM, Friedrich Hagedorn <[EMAIL PROTECTED]> >> wrote: >> > >> > On Tue, May 27, 2008 at 05:22:54AM -0700, astozzia wr

[sympy] Re: diff and subs

On Tue, May 27, 2008 at 04:28:22PM +0200, Ondrej Certik wrote: > > On Tue, May 27, 2008 at 3:56 PM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote: > > > > On Tue, May 27, 2008 at 05:22:54AM -0700, astozzia wrote: > >> > >> evec=dvecM/sqrt(s.dot(dvec,dvec)) > >> > >> Note that I had to use the 'Matr

[sympy] Re: diff and subs

On Tue, May 27, 2008 at 3:56 PM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote: > > On Tue, May 27, 2008 at 05:22:54AM -0700, astozzia wrote: >> >> evec=dvecM/sqrt(s.dot(dvec,dvec)) >> >> Note that I had to use the 'Matrix' and divide my the norm of the >> 'list'. Kinda weird... > > The problem is

[sympy] Re: diff and subs

On Tue, May 27, 2008 at 05:22:54AM -0700, astozzia wrote: > > evec=dvecM/sqrt(s.dot(dvec,dvec)) > > Note that I had to use the 'Matrix' and divide my the norm of the > 'list'. Kinda weird... The problem is that we dont have a true vector support in sympy yet. Specialy you cant define a function o

[sympy] Re: idea for sympy.org webpage

Hi, >>> Certain limitations of the of google app engine >>> (no outgoing RPC connections, you must use BigTable, no starting sys >>> process, etc) >>> would make it so knoboo won't work immediately on google app engine. >>> There are other solutions out there that suit running an online code >>>

[sympy] Re: division problem

On Tue, May 27, 2008 at 2:37 PM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote: > > Hello, > > from the 'diff and subs' thread I noticed the following problem with > the division operation: > > % ipython > [...] > > In [1]: from sympy import * > > In [2]: var('x y z') > Out[2]: (x, y, z) > > In [3]

[sympy] Re: diff and subs

On Tue, May 27, 2008 at 2:22 PM, astozzia <[EMAIL PROTECTED]> wrote: > > > > On May 26, 1:50 pm, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote: > >> >> The problem is that >> >> In [26]: type(dvec) >> Out[26]: >> >> so you have to convert your 'vector' to a sympy >> >> In [27]: mdvec=Matrix(dvec).T

[sympy] division problem

Hello, from the 'diff and subs' thread I noticed the following problem with the division operation: % ipython [...] In [1]: from sympy import * In [2]: var('x y z') Out[2]: (x, y, z) In [3]: v=Matrix(1,2,[x,y]) In [4]: v Out[4]: [x, y] In [5]: v/z Out[5]: [x/z, y/z] Thats ok, but In [6]:

[sympy] Re: rotating metrics, simplifications

Hi, to improve computations speed in case of symbolic matrices (as g_dd is) it would be convenient to use M.berkowitz_det() rather that M.det(): [EMAIL PROTECTED] ~/hg/sympy $ SYMPY_USE_CACHE=no ./bin/isympy -q Python 2.5.2 console for SymPy 0.5.15-hg (cache: off) In [1]: var("t omega") Out[1]:

[sympy] Re: diff and subs

On May 26, 1:50 pm, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote: > > The problem is that > > In [26]: type(dvec) > Out[26]: > > so you have to convert your 'vector' to a sympy > > In [27]: mdvec=Matrix(dvec).T great this works perfectly! I redid my definitions of the vectors and I simply def

[sympy] Re: EuroSciPy sprint?

Ondrej Certik wrote: > Hi, > > I, Robert Cimrman and Pearu Peterson are all going to be at EuroSciPy2008: > > http://www.scipy.org/EuroSciPy2008 > > so we were thinking with Pearu of going earlier and do some coding. > Would anyone else be interested? > Especially those living in Germany, right

[sympy] EuroSciPy sprint?

Hi, I, Robert Cimrman and Pearu Peterson are all going to be at EuroSciPy2008: http://www.scipy.org/EuroSciPy2008 so we were thinking with Pearu of going earlier and do some coding. Would anyone else be interested? Especially those living in Germany, right. :) This will be a perfect opportunity

[sympy] Re: rotating metrics, simplifications

2008/5/27 Friedrich Hagedorn <[EMAIL PROTECTED]>: > On Tue, May 27, 2008 at 12:07:33PM +0200, Friedrich Hagedorn wrote: >> >> On Tue, May 27, 2008 at 11:42:21AM +0200, Ondrej Certik wrote: >> > In [4]: g_dd >> > Out[4]: >> > ⎡ ⎛ 22⎞ ⎤ >> >

[sympy] Re: rotating metrics, simplifications

On Tue, May 27, 2008 at 12:07:33PM +0200, Friedrich Hagedorn wrote: > > On Tue, May 27, 2008 at 11:42:21AM +0200, Ondrej Certik wrote: > > In [4]: g_dd > > Out[4]: > > ⎡ ⎛ 22⎞ ⎤ > > ⎢-1 + ω*⎝x + y ⎠2*ω*y -2*ω*x

[sympy] Re: rotating metrics, simplifications

On Tue, May 27, 2008 at 11:42:21AM +0200, Ondrej Certik wrote: > Hi, > > I have a disk in the (x,y) plane rotating with the angular velocity > omega. Now I'd like to play with differential geomtry on the disk, so > I start with the Euclidean metrics in my laboratory system and > transform it to th

[sympy] Re: rotating metrics, simplifications

On Tue, May 27, 2008 at 11:47 AM, Ondrej Certik <[EMAIL PROTECTED]> wrote: > On Tue, May 27, 2008 at 11:42 AM, Ondrej Certik <[EMAIL PROTECTED]> wrote: >> Hi, >> >> I have a disk in the (x,y) plane rotating with the angular velocity >> omega. Now I'd like to play with differential geomtry on the di

[sympy] Re: rotating metrics, simplifications

On Tue, May 27, 2008 at 11:42 AM, Ondrej Certik <[EMAIL PROTECTED]> wrote: > Hi, > > I have a disk in the (x,y) plane rotating with the angular velocity > omega. Now I'd like to play with differential geomtry on the disk, so > I start with the Euclidean metrics in my laboratory system and > transfo

[sympy] rotating metrics, simplifications

Hi, I have a disk in the (x,y) plane rotating with the angular velocity omega. Now I'd like to play with differential geomtry on the disk, so I start with the Euclidean metrics in my laboratory system and transform it to the disk, I get this: In [1]: var("t omega") Out[1]: (t, ω) In [2]: g_dd =

[sympy] Re: ready for a release 0.5.15

Dear chu-ching! On Sun, May 25, 2008 at 4:52 AM, chu-ching huang <[EMAIL PROTECTED]> wrote: > > The sympy module has been updated in our platform (slax-linux based) > and the doc directory is also included. In our platform for scientific > computation and visualization, sympy in sage is replaced