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Diffstat (limited to 'noao/imred/ccdred/src/generic/icsigma.x')
| -rw-r--r-- | noao/imred/ccdred/src/generic/icsigma.x | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/noao/imred/ccdred/src/generic/icsigma.x b/noao/imred/ccdred/src/generic/icsigma.x new file mode 100644 index 00000000..bc0d9788 --- /dev/null +++ b/noao/imred/ccdred/src/generic/icsigma.x @@ -0,0 +1,205 @@ +# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc. + +include <imhdr.h> +include "../icombine.h" + + +# IC_SIGMA -- Compute the sigma image line. +# The estimated sigma includes a correction for the finite population. +# Weights are used if desired. + +procedure ic_sigmas (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 +real average[npts] # Average +real sigma[npts] # Sigma line (returned) + +int i, j, k, n1 +real wt, sigcor, sumwt +real a, sum + +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 = (Mems[d[1]+k] - a) ** 2 * wt + do j = 2, n1 { + wt = wts[Memi[m[j]+k]] + sum = sum + (Mems[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 = (Mems[d[1]+k] - a) ** 2 + do j = 2, n1 + sum = sum + (Mems[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 = (Mems[d[1]+k] - a) ** 2 * wt + sumwt = wt + do j = 2, n1 { + wt = wts[Memi[m[j]+k]] + sum = sum + (Mems[d[j]+k] - a) ** 2 * wt + sumwt = sumwt + wt + } + sigma[i] = sqrt (sum / sumwt * 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 = (Mems[d[1]+k] - a) ** 2 + do j = 2, n1 + sum = sum + (Mems[d[j]+k] - a) ** 2 + sigma[i] = sqrt (sum * sigcor) + } else + sigma[i] = blank + } + } + } +end + +# IC_SIGMA -- Compute the sigma image line. +# The estimated sigma includes a correction for the finite population. +# Weights are used if desired. + +procedure ic_sigmar (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 +real average[npts] # Average +real sigma[npts] # Sigma line (returned) + +int i, j, k, n1 +real wt, sigcor, sumwt +real a, sum + +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 = (Memr[d[1]+k] - a) ** 2 * wt + do j = 2, n1 { + wt = wts[Memi[m[j]+k]] + sum = sum + (Memr[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 = (Memr[d[1]+k] - a) ** 2 + do j = 2, n1 + sum = sum + (Memr[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 = (Memr[d[1]+k] - a) ** 2 * wt + sumwt = wt + do j = 2, n1 { + wt = wts[Memi[m[j]+k]] + sum = sum + (Memr[d[j]+k] - a) ** 2 * wt + sumwt = sumwt + wt + } + sigma[i] = sqrt (sum / sumwt * 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 = (Memr[d[1]+k] - a) ** 2 + do j = 2, n1 + sum = sum + (Memr[d[j]+k] - a) ** 2 + sigma[i] = sqrt (sum * sigcor) + } else + sigma[i] = blank + } + } + } +end |