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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 allns (a, b, npix, errfcn)
short a[ARB], b[ARB]
int npix, i
extern errfcn()
short errfcn()
errchk errfcn
begin
do i = 1, npix {
if (a[i] <= 0)
b[i] = errfcn (a[i])
else {
b[i] = log (real (a[i]))
}
}
end
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