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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# ALLN -- Compute the natural logarithm of a vector (generic). If the natural
# logarithm is undefined (x <= 0) a user supplied function is called to get
# the pixel value to be returned.
procedure alln$t (a, b, npix, errfcn)
PIXEL a[ARB], b[ARB]
int npix, i
extern errfcn()
PIXEL errfcn()
errchk errfcn
begin
do i = 1, npix {
$if (datatype == x)
if (a[i] == 0$f)
$else
if (a[i] <= 0$f)
$endif
b[i] = errfcn (a[i])
else {
$if (datatype == si)
b[i] = log (real (a[i]))
$else $if (datatype == l)
b[i] = log (double (a[i]))
$else
b[i] = log (a[i])
$endif $endif
}
}
end
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