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Fixed constant fit parameters (naive string substitution fails if a parameter

name is a substring of something else, e.g. another parameter name).

This is a rather large patch for a bug-fix release, but there doesn't seem to
be an easy fix. Unfortunately, fast muParser-provided numerical differentiation
doesn't work with this ansatz, so non-linear fitting with user-defined
functions gets noticably slower.

knut_f 2009-01-29

changed /branches/current_stable/scidavis/src/Fit.cpp
changed /branches/current_stable/scidavis/src/Fit.h
changed /branches/current_stable/scidavis/src/FitDialog.cpp
changed /branches/current_stable/scidavis/src/NonLinearFit.cpp
changed /branches/current_stable/scidavis/src/fit_gsl.cpp
changed /branches/current_stable/scidavis/src/fit_gsl.h
/branches/current_stable/scidavis/src/Fit.cpp Diff Switch to side-by-side view
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/branches/current_stable/scidavis/src/Fit.h Diff Switch to side-by-side view
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/branches/current_stable/scidavis/src/FitDialog.cpp Diff Switch to side-by-side view
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/branches/current_stable/scidavis/src/NonLinearFit.cpp Diff Switch to side-by-side view
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/branches/current_stable/scidavis/src/fit_gsl.cpp Diff Switch to side-by-side view
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/branches/current_stable/scidavis/src/fit_gsl.h Diff Switch to side-by-side view
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