Groups > comp.graphics.apps.gnuplot > #1197

FIT A DATAFILE THROUGH ANOTHER DATAFILE

From	Roberto Guerra IDV Novi <cipitaua@gmail.com>
Newsgroups	comp.graphics.apps.gnuplot
Subject	FIT A DATAFILE THROUGH ANOTHER DATAFILE
Date	2012-06-11 06:27 -0700
Organization	http://groups.google.com
Message-ID	<3c8bd4d3-6360-4e6b-b830-09db7c44bf46@5g2000vbf.googlegroups.com> (permalink)

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Hi,

I have a curve in a datafile that is supposed to be the weighted sum
of other two curves. I wish to find the coefficients for such sum so
that curve1=curve2*a+curve3*b.
I tried with the following fit:

 fit 0.0 "< paste curve1.dat curve2.dat curve3.dat" u 1:($2-$4*a-$6*b)
via a,b

but it sticks with the "Singular matrix" error.
Is there any workaround for that?

Thanks in advance,
Roberto

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FIT A DATAFILE THROUGH ANOTHER DATAFILE Roberto Guerra IDV Novi <cipitaua@gmail.com> - 2012-06-11 06:27 -0700
  Re: FIT A DATAFILE THROUGH ANOTHER DATAFILE Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2012-06-11 21:28 +0200

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