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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 abltk$t (a, b, c, npix)
PIXEL a[ARB]
PIXEL b
int c[ARB]
int npix
int i
$if (datatype == x)
real abs_b
$endif
begin
# The case b==0 is perhaps worth optimizing. On many machines this
# will save a memory fetch.
if (b == 0$f) {
$if (datatype == x)
call aclri (c, npix)
$else
do i = 1, npix
if (a[i] < 0)
c[i] = 1
else
c[i] = 0
$endif
} else {
$if (datatype == x)
abs_b = abs (b)
$endif
do i = 1, npix
$if (datatype == x)
if (abs (a[i]) < abs_b)
$else
if (a[i] < b)
$endif
c[i] = 1
else
c[i] = 0
}
end
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