MATIDN

Syntax MATIDN matrix
Location Math Package

This command forces the square numeric array matrix to be initialised so that the matrix is given the algebraic identity for matrices of that size. This gives the matrix the following format:

1 0 0 . . . 0 0 0
0 1 0 . . . 0 0 0
0 0 1 . . . 0 0 0
. . .       . . .
. . .       . . .
. . .       . . .
0 0 0 . . . 1 0 0
0 0 0 . . . 0 1 0
0 0 0 . . . 0 0 1

All elements on the diagonal line from the top left corner to the bottom right corner are set to 1 and all other elements are set to 0. This forms the identity matrix, which means that when a matrix of the same size is multiplied by this, the resultant matrix is the same as the original matrix, ie. matrix1 * matrix = matrix1.

CROSS-REFERENCE

MATMULT multiplies matrices.