--- ray/src/util/rmatrix.h	2014/05/31 05:02:37	2.1
+++ ray/src/util/rmatrix.h	2014/08/01 23:37:24	2.3
@@ -1,4 +1,4 @@
-/* RCSid $Id: rmatrix.h,v 2.1 2014/05/31 05:02:37 greg Exp $ */
+/* RCSid $Id: rmatrix.h,v 2.3 2014/08/01 23:37:24 greg Exp $ */
 /*
  * Header file for general matrix routines.
  */
@@ -15,13 +15,12 @@ extern "C" {
 /* General plane-ordered component matrix */
 typedef struct {
 	int	nrows, ncols, ncomp;
+	char	*info;
 	double	mtx[1];			/* extends struct */
 } RMATRIX;
 
-#define rmx_indx(rm,r,c,i)	(((i)*(rm)->nrows+(r))*(rm)->ncols+(c))
+#define rmx_lval(rm,r,c,i)	(rm)->mtx[((i)*(rm)->nrows+(r))*(rm)->ncols+(c)]
 
-#define rmx_lval(rm,r,c,i)	(rm)->mtx[rmx_indx(rm,r,c,i)]
-
 #define rmx_free(rm)		free(rm)
 
 /* Allocate a nr x nc matrix with n components */
@@ -30,6 +29,9 @@ extern RMATRIX	*rmx_alloc(int nr, int nc, int n);
 /* Load matrix from supported file type */
 extern RMATRIX	*rmx_load(const char *fname);
 
+/* Append header information associated with matrix data */
+extern int	rmx_addinfo(RMATRIX *rm, const char *info);
+
 /* Write matrix to file type indicated by dt */
 extern long	rmx_write(const RMATRIX *rm, int dtype, FILE *fp);
 
@@ -39,8 +41,8 @@ extern RMATRIX	*rmx_identity(int dim, int n);
 /* Duplicate the given matrix */
 extern RMATRIX	*rmx_copy(const RMATRIX *rm);
 
-/* Swap rows and columns in the given matrix in situ */
-extern int	rmx_transpose(RMATRIX *rm);
+/* Allocate and assign transposed matrix */
+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);