Re: [Gnuplot-info] Operating with gnuplot fuctions on data from file inside the 'using' command

[Thomas S. <t.s...@fz...>]

plot ... using (log($3/A0 + 1)):...


christoi wrote:
> 
> I am using (two sets of) data to make various plots. In the file
> 'extensometer.dat' I have force measurements in column 3 and displacement
> measurments in column 2. For the next plot, I want to do 
> 
> L0_ext = 80
> A0 = 12.51*2.19
> plot 'extensometer.dat' u log($3/A0 + 1):((1 + $3/A0)*$2/L0_ext) w l title
> 'Cauchy stress/logarithmic strain' lw 3
> 
> I.e. I want to operate on each displacement datapoint with basic algebraic
> functions but also the built in function 'log(x)', and then plot the data.
> However using the command above, I get an error message pointing to the
> log statement saying 'undefined value'.
> 
> Is there any way I can achieve this within gnuplot?
> 
> Thanks in advance!
> 
> 

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