Comment #2 on issue 3119 by asmeu...@gmail.com: Matrix Exponential http://code.google.com/p/sympy/issues/detail?id=3119
Matrix.exp works for the diagonalizable case, and shouldn't be too hard to extend to the non-diagonalizable case.
Maple's version of this includes an extra argument for a parameter (http://www.maplesoft.com/support/help/Maple/view.aspx?path=LinearAlgebra/MatrixExponential). Do you think that would be helpful?
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