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diff --git a/sys/mwcs/mwmmul.gx b/sys/mwcs/mwmmul.gx
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# MW_MMUL -- Matrix multiply.
+
+procedure mw_mmul$t (a, b, c, ndim)
+
+PIXEL	a[ndim,ndim]		#I left input matrix
+PIXEL	b[ndim,ndim]		#I right input matrix
+PIXEL	c[ndim,ndim]		#O output matrix
+int	ndim			#I dimensionality of system
+
+int	i, j, k
+PIXEL	v
+
+begin
+	do j = 1, ndim
+	    do i = 1, ndim {
+		v = 0
+		do k = 1, ndim
+		    v = v + a[k,j] * b[i,k]
+		c[i,j] = v
+	    }
+end