MUNIT

The MUNIT function returns a unit matrix for a given dimension, n, with a size of n x n. The unit matrix is also called the identity matrix. The MUNIT function takes just one argument, dimension, which should be a positive integer. The resulting matrix contains ones on the main diagonal and zeros in every other position. The formula in D5 returns a 3 x 3 unit matrix : With 3 given for dimension, the MUNIT function returns a 3 by 3 array like this: The formula in J5 returns a 5 x 5 unit matrix. With 5 given for dimension, the MUNIT function returns a 5 by 5 array like this: