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include <math/nlfit.h>
include <pkg/inlfit.h>
# IN_ERRORS -- Compute the reduced chi-square of the fit and the
# parameter errors. This procedure must be used instead of nlerrors()
# because the weigths are changed during the data rejection process.
# If no data rejection is used, then both procedures are equivalent.
procedure in_errors$t (in, nl, x, y, wts, npts, nvars, variance, chisqr,
scatter, rms, errors)
pointer in # INLFIT pointer
pointer nl # NLFIT pointer
PIXEL x[ARB] # Ordinates (npts * nvars)
PIXEL y[npts] # Data to be fit
PIXEL wts[npts] # Weights
int npts # Number of points
int nvars # Number of variables
PIXEL variance # variance of the fit (output)
PIXEL chisqr # reduced chi-squared of fit (output)
PIXEL scatter # additional scatter in equation
PIXEL rms # RMS of the fit (output)
PIXEL errors[ARB] # errors in coefficients (output)
int i
PIXEL in_rms$t(), nlstat$t
pointer sp, fit, wts1, rejpts
int in_geti()
pointer in_getp()
begin
# # Debug.
# call eprintf ("in_errors: in=%d, nl=%d, npts=%d, nvars=%d\n")
# call pargi (in)
# call pargi (nl)
# call pargi (npts)
# call pargi (nvars)
# Allocate memory for fit and weights.
call smark (sp)
call salloc (fit, npts, TY_PIXEL)
call salloc (wts1, npts, TY_PIXEL)
# Set zero weight for rejeceted points.
call amov$t (wts, Mem$t[wts1], npts)
if (in_geti (in, INLNREJPTS) > 0) {
rejpts = in_getp (in, INLREJPTS)
do i = 1, npts {
if (Memi[rejpts+i-1] == YES)
Mem$t[wts1+i-1] = PIXEL (0.0)
}
}
# Evaluate the fit, and compute the rms, reduced chi
# squared and errors.
call nlvector$t (nl, x, Mem$t[fit], npts, nvars)
call nlerrors$t (nl, y, Mem$t[fit], Mem$t[wts1], npts,
variance, chisqr, errors)
rms = in_rms$t (y, Mem$t[fit], Mem$t[wts1], npts)
scatter = nlstat$t (nl, NLSCATTER)
# Free memory.
call sfree (sp)
end
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