Matrix addition, subtraction and products respectively.
For matrix addition and subtraction all matrices must have the same shape.
For matrix product the number of columns of one matrix must equal the number of rows in the following matrix.
Computes (matrix* M ...) with n arguments, but more efficiently. M must be a square-matrix? and n must be nonnegative.
Computes the matrix zM, a matrix of the same shape as M where each entry in M is multiplied with z.
Returns #t when its arguments are the same size and are equal entrywise.