I want to define a matrix valued function. for example..

If I have a polynomial of a matrix with me say $f(x)$ and I want to check $f(A)$. What can be done better? The following will work for numbers but not for matrix.

var('x') f(x)=2x^2+x+3 print f(A)# this is what I want as an answer..

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## In the above if I want to replace my x by a matrix what I have to do?

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So, ultimate aim is to find define a polynomial which can take matrix Thanks in advance...