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Groups > comp.graphics.apps.gnuplot > #4168

different behaviour gnuplot4 and 5 concerning "Implied independent variable y not found in fit function"

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In a batch-file which worked fine for Gnuplot 4, I had the following lines:
f(x) = a*10e-8*(exp(x/b)-1)
err1(y)=0.01*0.033*y+2e-9
err2(y)=0.01*0.0031*y+20e-9
err3(y)=0.01*0.0034*y+200e-9
err4(y)=0.01*0.0045*y+2e-6
error(y)=(y<10e-6)? err1(y):(y<100e-6)? err2(y):(y<1e-3)? err3(y):err4(y)
a=30e-3
b=50e-3
fit f(x) '1n4148_linstep_1na_10ma.dat' using ($1):($2):(error($2)) via a,b

This worked fine in Gnuplot 4, however when I try this in Gnuplot 5, I get the following error message:
	> Implied independent variable y not found in fit function.
	> Assuming version 4 syntax with zerror in column 3 but no zerror keyword.


Does anyone here how to make the batch-file work again?

kind regards,
Hugo Coolens

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different behaviour gnuplot4 and 5 concerning  "Implied independent variable y not found in fit function" "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2019-03-21 08:02 -0700
  Re: different behaviour gnuplot4 and 5 concerning "Implied independent variable y not found in fit function" Karl Ratzsch <mail.kfr@gmx.net> - 2019-03-21 22:02 +0100
    Re: different behaviour gnuplot4 and 5 concerning "Implied independent variable y not found in fit function" "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2019-03-22 01:14 -0700

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