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diff --git a/sys/mwcs/mwltran.gx b/sys/mwcs/mwltran.gx
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"../mwcs.h"
+
+# MW_LTRAN -- Perform a general N-dimensional linear transformation, i.e.,
+# matrix multiply and translation.
+
+procedure mw_ltran$t (p1, p2, ltm, ltv, ndim)
+
+PIXEL	p1[ndim]			#I input point
+PIXEL	p2[ndim]			#O transformed output point
+PIXEL	ltm[ndim,ndim]			#I linear transformation matrix
+PIXEL	ltv[ndim]			#I linear translation vector
+int	ndim				#I dimension of system
+
+int	i, j
+PIXEL	p3[MAX_DIM]
+
+begin
+	call amov$t (p1, p3, ndim)
+	do j = 1, ndim {
+	    p2[j] = ltv[j]
+	    do i = 1, ndim
+		p2[j] = p2[j] + ltm[i,j] * p3[i]
+	}
+end