Re: [Gnuplot-info] get data then calculate and then plot

[fly a. <vic...@gm...>]

Hans-Bernhard Br=C3=B6ker wrote:
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> Markus Feldmann wrote:
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>> I have got a data file with some values.
>> Therfor i wanna subtract some pairs of values and then plot them.
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> *Which* pairs to you want to subtract from each other?
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>> As I know you can select values in a data file by the "using" command,
>> but I think there is no possibility to calculate this values before i
>> plot this?
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> If what you're trying to do isn't something like
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> =09plot 'data' using 1:($2-$3)
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> then gnuplot can't do it (--> 'help using').  In that case, you have to=
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> do the work outside, in a data preconditioning program, which you can=20
> then use from inside gnuplot like this
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> =09plot "< program data"
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> See 'help datafile special'
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Couldn't one just write a function and do
f(x,y)=3Dx-y
plot 'file' u 1:(f($2,$3))? It would probably be easier than reformatting
input files

Victor


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