Hello. I am having to replace certain functions in expressions
contained in a matrix (which I derived from using jacobian) but I find
that I cannot do replace on a Matrix -- I have to do
replace-assignment on each individual item in the Matrix:
>>> from sympy import symbols,Function,Matrix
>>> F,G=symbols('F,G',cls=Function)
>>> M=Matrix(2,2, lambda i,j: F(i+j))
>>> M
[F(0), F(1)]
[F(1), F(2)]
>>> M.replace(F,G)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3/dist-packages/sympy/matrices/matrices.py",
line 3010, in __getattr__
raise AttributeError("Matrix has no attribute %s." % attr)
AttributeError: Matrix has no attribute replace.
>>> for i in range(len(M)):M[i]=M[i].replace(F,G)
...
>>> M
[G(0), G(1)]
[G(1), G(2)]
This additional trouble is unnecessary IMHO. Is there a reason why
Matrix cannot directly support replace when it can support subs (as
seen in even the tutorial)?
--
Shriramana Sharma
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