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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# ACHTxy -- Change datatype of vector from "x" to "y" (doubly generic).
# The operation is performed in such a way that the output vector can be
# the same as the input vector without overwriting data.
procedure achtdx (a, b, npix)
double a[ARB]
complex b[ARB]
int npix
int i
begin
do i = 1, npix
b[i] = complex(real(a[i]),0.0)
end
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