Re: [Gnuplot-info] Row operations

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

use an up-to-date version of gnuplot and store the 'old' value to a variable
inside the 'using' option:

y_old=0
plot 'datafilename' using 1:(temp=$2-y_old , y_old=$2 , temp)


Bernardo Trindade wrote:
> 
> Hi y'all, I'm a bit experienced with GNUPlot and I'm trying to make a plot
> of a data file and the value that I wanted plotted is the difference
> between the value in the row i minus the value in row i-1. I know that
> using $ you can perform operation with values from different columns but I
> don't know how to do it for different rows at the same column. 
> Does anyone here have a clue on how (and if) GNUPlot does that?
> 
> Thanks in advance! :) 
> Bernardo.
> 

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