Matrix Calculator

This calculator adds, subtracts and multiplies square matrices, and finds the determinant and inverse, at 2 x 2, 3 x 3 or 4 x 4. Type each matrix as rows separated by semicolons and entries by commas, such as 1,2;3,4. Results come back row by row, with the method used and, for an inverse, a check that A times the inverse gives the identity. A matrix whose determinant is zero has no inverse, and the calculator says so instead of returning one.