Matrix Calculator

This calculator covers the four basic operations on small square matrices: addition, subtraction, multiplication and the determinant. It takes 2x2 and 3x3 matrices only, typed as rows of numbers with commas between the entries and a semicolon between the rows, so 1,2;3,4 is a two by two matrix. The answer comes back one row at a time, and the determinant tab also says whether the matrix is invertible. Larger matrices, inverses, transposes and eigenvalues are outside what it does.