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SUBROUTINE MSUB

PURPOSE
   SUBTRACT TWO MATRICES ELEMENT BY ELEMENT TO FORM RESULTANT
   MATRIX

USAGE
   CALL MSUB(A,B,R,N,M,MSA,MSB)

DESCRIPTION OF PARAMETERS
   A - NAME OF INPUT MATRIX
   B - NAME OF INPUT MATRIX
   R - NAME OF OUTPUT MATRIX
   N - NUMBER OF ROWS IN A,B,R
   M - NUMBER OF COLUMNS IN A,B,R
   MSA - ONE DIGIT NUMBER FOR STORAGE MODE OF MATRIX A
	  0 - GENERAL
	  1 - SYMMETRIC
	  2 - DIAGONAL
   MSB - SAME AS MSA EXCEPT FOR MATRIX B

REMARKS
   NONE

SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
   LOC

METHOD
   STRUCTURE OF OUTPUT MATRIX IS FIRST DETERMINED. SUBTRACTION
   OF MATRIX B ELEMENTS FROM CORRESPONDING MATRIX A ELEMENTS
   IS THEN PERFORMED.
   THE FOLLOWING TABLE SHOWS THE STORAGE MODE OF THE OUTPUT
   MATRIX FOR ALL COMBINATIONS OF INPUT MATRICES
		 A		  B		    R
	      GENERAL	       GENERAL		GENERAL
	      GENERAL	       SYMMETRIC	GENERAL
	      GENERAL	       DIAGONAL 	GENERAL
	      SYMMETRIC        GENERAL		GENERAL
	      SYMMETRIC        SYMMETRIC	SYMMETRIC
	      SYMMETRIC        DIAGONAL 	SYMMETRIC
	      DIAGONAL	       GENERAL		GENERAL
	      DIAGONAL	       SYMMETRIC	SYMMETRIC
	      DIAGONAL	       DIAGONAL 	DIAGONAL