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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <math/curfit.h>
include "icfit.h"
include "names.h"
# IC_FERRORS -- Compute error diagnositic information.
procedure ic_ferrors$t (ic, cv, x, y, wts, npts, fd)
pointer ic # ICFIT pointer
pointer cv # Curfit pointer
PIXEL x[ARB] # Ordinates
PIXEL y[ARB] # Abscissas
PIXEL wts[ARB] # Weights
int npts # Number of data points
int fd # Output file descriptor
int i, n, deleted, ncoeffs
PIXEL chisqr, rms
pointer sp, fit, wts1, coeffs, errors
int $tcvstati()
PIXEL ic_rms$t()
begin
# Determine the number of coefficients and allocate memory.
ncoeffs = $tcvstati (cv, CVNCOEFF)
call smark (sp)
call salloc (coeffs, ncoeffs, TY_PIXEL)
call salloc (errors, ncoeffs, TY_PIXEL)
if (npts == IC_NFIT(ic)) {
# Allocate memory for the fit.
n = npts
call salloc (fit, n, TY_PIXEL)
call salloc (wts1, n, TY_PIXEL)
# Eliminate rejected points and count deleted points.
call amov$t (wts, Mem$t[wts1], n)
if (IC_NREJECT(ic) > 0) {
do i = 1, npts {
if (Memi[IC_REJPTS(ic)+i-1] == YES)
Mem$t[wts1+i-1] = 0.
}
}
deleted = 0
do i = 1, n {
if (wts[i] == 0.)
deleted = deleted + 1
}
# Get the coefficients and compute the errors.
call $tcvvector (cv, x, Mem$t[fit], n)
call $tcvcoeff (cv, Mem$t[coeffs], ncoeffs)
call $tcverrors (cv, y, Mem$t[wts1], Mem$t[fit], n, chisqr,
Mem$t[errors])
rms = ic_rms$t (x, y, Mem$t[fit], Mem$t[wts1], n)
} else {
# Allocate memory for the fit.
n = IC_NFIT(ic)
call salloc (fit, n, TY_PIXEL)
call salloc (wts1, n, TY_PIXEL)
# Eliminate rejected points and count deleted points.
call amov$t (Mem$t[IC_WTSFIT(ic)], Mem$t[wts1], n)
if (IC_NREJECT(ic) > 0) {
do i = 1, npts {
if (Memi[IC_REJPTS(ic)+i-1] == YES)
Mem$t[wts1+i-1] = 0.
}
}
deleted = 0
do i = 1, n {
if (wts[i] == 0.)
deleted = deleted + 1
}
# Get the coefficients and compute the errors.
call $tcvvector (cv, Mem$t[IC_XFIT(ic)], Mem$t[fit], n)
rms = ic_rms$t (Mem$t[IC_XFIT(ic)], Mem$t[IC_YFIT(ic)],
Mem$t[fit], Mem$t[wts1], n)
call $tcvcoeff (cv, Mem$t[coeffs], ncoeffs)
call $tcverrors (cv, Mem$t[IC_YFIT(ic)], Mem$t[wts1], Mem$t[fit],
n, chisqr, Mem$t[errors])
}
# Print the error analysis.
call fprintf (fd, "# total points = %d\nsample points = %d\n")
call pargi (npts)
call pargi (n)
call fprintf (fd, "# nrejected = %d\ndeleted = %d\n")
call pargi (IC_NREJECT(ic))
call pargi (deleted)
call fprintf (fd, "# RMS = %7.4g\n")
call parg$t (rms)
call fprintf (fd, "# square root of reduced chi square = %7.4g\n")
call parg$t (sqrt (chisqr))
# Free allocated memory.
call sfree (sp)
end
# IC_RMS -- Compute RMS of points which have not been deleted.
PIXEL procedure ic_rms$t (x, y, fit, wts, npts)
PIXEL x[ARB] # Ordinates
PIXEL y[ARB] # Abscissas
PIXEL fit[ARB] # Fit
PIXEL wts[ARB] # Weights
int npts # Number of data points
int i, n
PIXEL resid, rms
begin
rms = 0.
n = 0
do i = 1, npts {
if (wts[i] == 0.)
next
resid = y[i] - fit[i]
rms = rms + resid * resid
n = n + 1
}
if (n > 0)
rms = sqrt (rms / n)
return (rms)
end
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