I got this bug report from the "report a problem" link in the
notebook:
problem description:
I did some basic control systems theory, but the output looks way too
much complicated, previous version was much better in this aspect.
A = matrix([[1,-3,-1,-2],[2,-1,1,-1],[0,2,-3,1],[-3,4,-1,1]])
B = matrix([[0,-2],[1,0],[0,1],[3,0]])
C = matrix([[1,0,4,0],[0,0,2,1]])
D = matrix([[0,0],[0,0]])
I = identity_matrix(4)
s = var('s')
P = C*(s*I-A)^(-1)*B+D
P
P.simplify()
P.expand()
---
expected:
a fraction with a simple numerator and denominator like sage 3.4.2
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