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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_ferrorsr (ic, cv, x, y, wts, npts, fd)
pointer ic # ICFIT pointer
pointer cv # Curfit pointer
real x[ARB] # Ordinates
real y[ARB] # Abscissas
real wts[ARB] # Weights
int npts # Number of data points
int fd # Output file descriptor
int i, n, deleted, ncoeffs
real chisqr, rms
pointer sp, fit, wts1, coeffs, errors
int rcvstati()
real ic_rmsr()
begin
# Determine the number of coefficients and allocate memory.
ncoeffs = rcvstati (cv, CVNCOEFF)
call smark (sp)
call salloc (coeffs, ncoeffs, TY_REAL)
call salloc (errors, ncoeffs, TY_REAL)
if (npts == IC_NFIT(ic)) {
# Allocate memory for the fit.
n = npts
call salloc (fit, n, TY_REAL)
call salloc (wts1, n, TY_REAL)
# Eliminate rejected points and count deleted points.
call amovr (wts, Memr[wts1], n)
if (IC_NREJECT(ic) > 0) {
do i = 1, npts {
if (Memi[IC_REJPTS(ic)+i-1] == YES)
Memr[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 rcvvector (cv, x, Memr[fit], n)
call rcvcoeff (cv, Memr[coeffs], ncoeffs)
call rcverrors (cv, y, Memr[wts1], Memr[fit], n, chisqr,
Memr[errors])
rms = ic_rmsr (x, y, Memr[fit], Memr[wts1], n)
} else {
# Allocate memory for the fit.
n = IC_NFIT(ic)
call salloc (fit, n, TY_REAL)
call salloc (wts1, n, TY_REAL)
# Eliminate rejected points and count deleted points.
call amovr (Memr[IC_WTSFIT(ic)], Memr[wts1], n)
if (IC_NREJECT(ic) > 0) {
do i = 1, npts {
if (Memi[IC_REJPTS(ic)+i-1] == YES)
Memr[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 rcvvector (cv, Memr[IC_XFIT(ic)], Memr[fit], n)
rms = ic_rmsr (Memr[IC_XFIT(ic)], Memr[IC_YFIT(ic)],
Memr[fit], Memr[wts1], n)
call rcvcoeff (cv, Memr[coeffs], ncoeffs)
call rcverrors (cv, Memr[IC_YFIT(ic)], Memr[wts1], Memr[fit],
n, chisqr, Memr[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 pargr (rms)
call fprintf (fd, "# square root of reduced chi square = %7.4g\n")
call pargr (sqrt (chisqr))
# Free allocated memory.
call sfree (sp)
end
# IC_RMS -- Compute RMS of points which have not been deleted.
real procedure ic_rmsr (x, y, fit, wts, npts)
real x[ARB] # Ordinates
real y[ARB] # Abscissas
real fit[ARB] # Fit
real wts[ARB] # Weights
int npts # Number of data points
int i, n
real 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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