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#======================================================================
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# M R Q C O F . P L
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# doc: Wed Feb 24 15:14:39 1999
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# dlm: Thu Feb 27 09:40:41 2003
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# (c) 1999 A.M. Thurnherr
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# uE-Info: 30 0 NIL 0 0 72 2 2 4 NIL ofnI
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#======================================================================
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# MRQCOF routine from Numerical Recipes adapted for ANTS
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# Notes:
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# - data which has $antsFlagged[] TRUE is ignored
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# - x,y,sig are field numbers for data in $ants_
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# - if sig is a negative number, -sig is used as constant input stddev
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# - @A, @listA, @alpha, @beta, $chisq, &funcs are passed as references
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# HISTORY:
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# - Feb 24, 1999: - ported from c-source
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# - Jul 31, 1999: - BUG: first elt in $ants_ was ignored!
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require "$ANTS/nrutil.pl";
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sub mrqcof($$$$$$$$$)
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{
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my($xfnr,$yfnr,$sig,$AR,$listAR,$alphaR,$betaR,$chiSqR,$funcsR) = @_;
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my($k,$j,$i);
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my($ymod,$wt,$sig2i,$dy,@dyda);
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&vector(\@dyda,1,$#{$AR});
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for ($j=1; $j<=$#{$listAR}; $j++) {
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for ($k=1; $k<=$j; $k++) { $alphaR->[$j][$k] = 0.0; }
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$betaR->[$j] = 0.0;
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}
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$$chiSqR = 0.0;
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for ($i=0; $i<=$#ants_; $i++) {
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next if ($antsFlagged[$i]);
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$ymod = &$funcsR($ants_[$i][$xfnr],$AR,\@dyda);
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if ($sig > 0) { # field number
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$sig2i = 1.0/($ants_[$i][$sig]*$ants_[$i][$sig]);
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} else { # const value
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$sig2i = 1.0/($sig*$sig);
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}
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$dy = $ants_[$i][$yfnr] - $ymod;
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for ($j=1; $j<=$#{$listAR}; $j++) {
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$wt = $dyda[$listAR->[$j]]*$sig2i;
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for ($k=1; $k<=$j; $k++) {
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$alphaR->[$j][$k] += $wt*$dyda[$listAR->[$k]];
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# print(STDERR "alpha[$j][$k] = $alphaR->[$j][$k]\n");
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# print(STDERR "$wt,$dyda[$listAR->[$k]]\n");
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}
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$betaR->[$j] += $dy*$wt;
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}
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$$chiSqR += $dy*$dy*$sig2i;
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}
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for ($j=2; $j<=$#{$listAR}; $j++) {
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for ($k=1; $k<=$j-1; $k++) {
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$alphaR->[$k][$j] = $alphaR->[$j][$k];
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}
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}
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}
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1;
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