Given procedures VECTOR-REF and FILL-MATRIX!, returns a procedure MATRIX-MAP of the form MATRIX-MAP:: M * N * A * F * [IX * IY * EX * EY] -> B
Where procedure MATRIX-MAP applies the map operation on a matrix A of size M x N with the values returned by applying procedure F to each pair of indices and the corresponding value at that position in the matrix.
Procedure F is of the form LAMBDA I J V -> U, where V is a matrix element at position (I,J) and U is corresponding element in the return matrix.
Optional arguments IX IY EX EY may specify a sub-matrix in matrix A.
VECTOR-REF is one of the homogeneous vector accessor procedures from SRFI-4.