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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ABLEK -- Vector boolean less than or equals constant.  C[i], type INT,
+# is set to 1 if A[i] is less than or equal to B, else C[i] is set to zero.
+
+procedure ablekl (a, b, c, npix)
+
+long	a[ARB]
+long	b
+int	c[ARB]
+int	npix
+int	i
+
+begin
+	# The case b==0 is perhaps worth optimizing.  On many machines this
+	# will save a memory fetch.
+
+	if (b == 0) {
+	    do i = 1, npix
+		if (a[i] <= 0)
+		    c[i] = 1
+		else
+		    c[i] = 0
+	} else {
+	    do i = 1, npix
+		if (a[i] <= b)
+		    c[i] = 1
+		else
+		    c[i] = 0
+	}
+end