>> It's a mathematical problem so no uncertainty is present in the >> initial values. And even if there was, if there are many orders of >> magnitude differences between the entries in the matrix floating point >> does not suffice for various things like eigenvalue calculation and >> stuff like that. > > Well, if you want to do eigenvalue calculations, you are going to have to > start > doing numerical approximations anyways. There is no analytical solution for > matrices larger than 4x4.
Sure! (I didn't explain the whole thing yet, see the other reply where I actually do.) > Sympy will do inverses of matrices over rationals for you, though: > > |4> from sympy import * > > |6> m = Matrix([[S(1)/2, S(1)/3], [S(1)/4, S(1)/5]]) > > |7> m > [1/2, 1/3] > [1/4, 1/5] > > |8> m.inv() > [ 12, -20] > [-15, 30] Thanks a lot! This sounds like the simplest solution so far. I don't need to call Maple after all :) Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
