iml

[bri11]

how would you create a subroutine that accepts an nxn matrix, finds its inverse if the determinant is 0 or prints an error if the matrix's determinant isn't 0?

[Rick_SAS]

Since you have asked several elementary questions, here is a link to an article that might help: How to learn SAS/IML: Five resources for the beginner - The DO Loop

In particular, tip #4 is relevant. When you write your funtion, you will need to use the

RETURN statement

IF-THEN/ELSE statement

DET function, and

INV function

BTW, your logic is backwards: if the determinant is NOT zero, you can compute the inverse.