Multiplication

Robert Israel — Wed, 10 Mar 2010 02:53:47 Z

There are several ways to create a matrix, of which the Matrix command is probably the most useful here. The number of rows and columns (n and q in the case of the result of this procedure) are input parameters of the procedure. You don't need a loop, because you can give the Matrix command a procedure to tell it how to produce the matrix elements. Thus your answer could be of the form

> MULTIPLYMATRIX:= (A,B,n,m,q) -> Matrix(n,q, (i,j) -> ***)

where *** is a formula for the (i,j) matrix element of the product A . B.

A problem I have with this question is that it says "Your procedure should print the result matrix", which I doubt is meant to be taken literally: the procedure I outlined above will produce the product matrix as its result, which will be printed if you enter
something like

> MATRIXMULTIPLY(A,B,n,m,q);

(for appropriate A, B, n, m and q). Or does the instructor really want a print statement in the procedure?

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Multiplication