1 files changed, 31 insertions, 0 deletions
diff --git a/sys/vops/ak/abltkr.x b/sys/vops/ak/abltkr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ABLTK -- Vector boolean less than constant.  C[i], type INT, is set to 1 if
+# A[i] is less than B, else C[i] is set to zero.
+
+procedure abltkr (a, b, c, npix)
+
+real	a[ARB]
+real	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 == 0.0) {
+	    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