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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include "../icombine.h"
$for (sird)
# IC_SIGMA -- Compute the sigma image line.
# The estimated sigma includes a correction for the finite population.
# Weights are used if desired.
procedure ic_sigma$t (d, m, n, wts, npts, average, sigma)
pointer d[ARB] # Data pointers
pointer m[ARB] # Image ID pointers
int n[npts] # Number of points
real wts[ARB] # Weights
int npts # Number of output points per line
$if (datatype == sil)
real average[npts] # Average
real sigma[npts] # Sigma line (returned)
$else
PIXEL average[npts] # Average
PIXEL sigma[npts] # Sigma line (returned)
$endif
int i, j, k, n1
real wt, sigcor, sumwt
$if (datatype == sil)
real a, sum
$else
PIXEL a, sum
$endif
include "../icombine.com"
begin
if (dflag == D_ALL) {
n1 = n[1]
if (dowts) {
if (n1 > 1)
sigcor = real (n1) / real (n1 - 1)
else
sigcor = 1.
do i = 1, npts {
k = i - 1
a = average[i]
wt = wts[Memi[m[1]+k]]
sum = (Mem$t[d[1]+k] - a) ** 2 * wt
do j = 2, n1 {
wt = wts[Memi[m[j]+k]]
sum = sum + (Mem$t[d[j]+k] - a) ** 2 * wt
}
sigma[i] = sqrt (sum * sigcor)
}
} else {
if (n1 > 1)
sigcor = 1. / real (n1 - 1)
else
sigcor = 1.
do i = 1, npts {
k = i - 1
a = average[i]
sum = (Mem$t[d[1]+k] - a) ** 2
do j = 2, n1
sum = sum + (Mem$t[d[j]+k] - a) ** 2
sigma[i] = sqrt (sum * sigcor)
}
}
} else if (dflag == D_NONE) {
do i = 1, npts
sigma[i] = blank
} else {
if (dowts) {
do i = 1, npts {
n1 = n[i]
if (n1 > 0) {
k = i - 1
if (n1 > 1)
sigcor = real (n1) / real (n1 -1)
else
sigcor = 1
a = average[i]
wt = wts[Memi[m[1]+k]]
sum = (Mem$t[d[1]+k] - a) ** 2 * wt
sumwt = wt
do j = 2, n1 {
wt = wts[Memi[m[j]+k]]
sum = sum + (Mem$t[d[j]+k] - a) ** 2 * wt
sumwt = sumwt + wt
}
if (sumwt > 0)
sigma[i] = sqrt (sum / sumwt * sigcor)
else {
sum = (Mem$t[d[1]+k] - a) ** 2
do j = 2, n1
sum = sum + (Mem$t[d[j]+k] - a) ** 2
sigma[i] = sqrt (sum / n1 * sigcor)
}
} else
sigma[i] = blank
}
} else {
do i = 1, npts {
n1 = n[i]
if (n1 > 0) {
k = i - 1
if (n1 > 1)
sigcor = 1. / real (n1 - 1)
else
sigcor = 1.
a = average[i]
sum = (Mem$t[d[1]+k] - a) ** 2
do j = 2, n1
sum = sum + (Mem$t[d[j]+k] - a) ** 2
sigma[i] = sqrt (sum * sigcor)
} else
sigma[i] = blank
}
}
}
end
$endfor
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