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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# ALOG -- Compute the logarithm to the base 10 of a vector (generic). If the
# logarithm is undefined (x <= 0) a user supplied function is called to get
# the function value.
procedure alog$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 {
# Note Fortran standard forbids log10(cplx).
$if (datatype == xsi)
b[i] = log10 (real (a[i]))
$else $if (datatype == l)
b[i] = log10 (double (a[i]))
$else
b[i] = log10 (a[i])
$endif $endif
}
}
end
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