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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 abltkl (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