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include "sensfunc.h"
# SF_SHIFT -- Shift or unshift all standard stars to have zero mean residual.
procedure sf_shift (stds, nstds, flag)
pointer stds[nstds] # Standard star data
int nstds # Number of standard stars
int flag # Shift flag
pointer x, y, w, f
int i, j, n, nshift
real shift, shift1, minshift
begin
# If flag is YES then unshift the data.
if (flag == YES) {
do i = 1, nstds {
if (STD_FLAG(stds[i]) == SF_EXCLUDE)
next
n = STD_NWAVES(stds[i])
if (n == 0)
next
y = STD_SENS(stds[i])
call asubkr (Memr[y], STD_SHIFT(stds[i]), Memr[y], n)
STD_SHIFT(stds[i]) = 0.
}
flag = NO
call printf ("Data unshifted")
return
}
# Determine the shifts needed to make the mean residual zero.
# Also determine the minimum shift.
minshift = 0.
do i = 1, nstds {
if (STD_FLAG(stds[i]) == SF_EXCLUDE)
next
n = STD_NWAVES(stds[i])
if (n == 0)
next
x = STD_WAVES(stds[i])
y = STD_SENS(stds[i])
w = STD_WTS(stds[i])
f = STD_FIT(stds[i])
nshift = 0
shift = 0.
shift1 = 0.
do j = 1, n {
shift1 = shift1 + Memr[f+j-1] - Memr[y+j-1]
if (Memr[w+j-1] > 0.) {
shift = shift + Memr[f+j-1] - Memr[y+j-1]
nshift = nshift + 1
}
}
if (nshift > 0) {
shift = STD_SHIFT(stds[i]) + shift / nshift
if (shift < minshift)
minshift = shift
} else
shift = STD_SHIFT(stds[i]) + shift1 / n
STD_SHIFT(stds[i]) = shift
}
# Adjust the shifts to be upwards.
do i = 1, nstds {
if (STD_FLAG(stds[i]) == SF_EXCLUDE)
next
n = STD_NWAVES(stds[i])
if (n == 0)
next
y = STD_SENS(stds[i])
shift = STD_SHIFT(stds[i]) - minshift
call aaddkr (Memr[y], shift, Memr[y], n)
STD_SHIFT(stds[i]) = shift
}
flag = YES
call printf ("Data shifted")
end
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