--- ray/src/util/rmatrix.h	2015/05/04 20:53:21	2.7
+++ ray/src/util/rmatrix.h	2018/10/31 22:19:57	2.9
@@ -1,4 +1,4 @@
-/* RCSid $Id: rmatrix.h,v 2.7 2015/05/04 20:53:21 greg Exp $ */
+/* RCSid $Id: rmatrix.h,v 2.9 2018/10/31 22:19:57 greg Exp $ */
 /*
  * Header file for general matrix routines.
  */
@@ -20,7 +20,7 @@ typedef struct {
 	double	mtx[1];			/* extends struct */
 } RMATRIX;
 
-#define rmx_lval(rm,r,c,i)	(rm)->mtx[(i)+(rm)->ncomp*((c)+(rm)->ncols*(r))]
+#define rmx_lval(rm,r,c,i)	(rm)->mtx[(i)+(rm)->ncomp*((c)+(size_t)(rm)->ncols*(r))]
 
 /* Allocate a nr x nc matrix with n components */
 extern RMATRIX	*rmx_alloc(int nr, int nc, int n);
@@ -51,6 +51,9 @@ extern RMATRIX	*rmx_transpose(const RMATRIX *rm);
 
 /* Multiply (concatenate) two matrices and allocate the result */
 extern RMATRIX	*rmx_multiply(const RMATRIX *m1, const RMATRIX *m2);
+
+/* Element-wise multiplication (or division) of m2 into m1 */
+extern int	rmx_elemult(RMATRIX *m1, const RMATRIX *m2, int divide);
 
 /* Sum second matrix into first, applying scale factor beforehand */
 extern int	rmx_sum(RMATRIX *msum, const RMATRIX *madd, const double sf[]);