Question: Substituting Variables into Matricies

I am trying to make substitutions into a matrix using the subs() command, but it does not work.

for example

A:= matrix([[a,b,c],[d,e,f]]):



It will not make any substitutions into a matrix or vector and i cant figure out why.  I tried using [inplace] which is

" The inplace option only applies when substituting into an rtable (such as Array, Matrix, or Vector) with no indexing function. When inplace is specified, the input rtable is updated in-place.  The result is the updated original expr rtable, rather than a copy."


Any help is appreciated




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