I would like to write an expression using Matrix symbols, and then evaluate
it by substituting concrete Matrix values. However, the resulting Matrix
expression will not simplify.
# set up general expression
n = Symbol('n')
r1 = MatrixSymbol('r1',n,1)
r2 = MatrixSymbol('r2',n,1)
d = r2 - r1
#
When used with explicitly defined Matrix objects, MatrixExpressions were
intended to be lazy by default. The idea here is that if you wanted
immediate evaluation you would have used standard arithmetic operators
which would have pointed you to Matrix.__add__ etc. and forced immediate
evaluation.
Usually the doit() method applies such rules.
Aaron Meurer
On Nov 22, 2013, at 9:07 AM, Matthew Rocklin wrote:
When used with explicitly defined Matrix objects, MatrixExpressions were
intended to be lazy by default. The idea here is that if you wanted
immediate evaluation you would have used
