Graphics, Figures & Tables ⇒ Altering data file values

[jhapk]

Hi,

I have a data file like this:

x Y
0.2 0.5
0.4 0.6
0.5 0.5

I want to plot Y vs F(x), where F(x) = a simple mathematical function of x, e.g. F(x) = (x-1)/2/x

How can I use pgfplots to do this?

Thanks

[localghost]

These kinds of plots are clearly explained in the pgfplots manual.


Best regards
Thorsten

[jhapk]

The \thisrow command helped me do it. Something like

Code: Select all

\addplot table [x expr=(\thisrow{x}-1)/2/\thisrow{x} ,y=Y]{name_of_datafile}; 

solves the problem.