On Wednesday, November 15th, 2006 at 17:14 h Marco Calviani
wrote:
> i would like to plot on the y axis of the graph
> "function/(energy-(energy-1))" where energy-1 is the
> "energy" column before the active one. For example for
> the table above that would be 30/(3-2).
> Is this possible with gnuplot?
As I see it there is no sophisticated way using the interna
of gnuplot, since the programme usually is used for working
with one datapoint (row) at the same time.
The 'easiest' way (or at least the way I would solute this
problem) is to add another column, which lists the values
of (energy-1). This may be done automatically by a small,
self written programme or by a script for your favourite
table calculating programme. You could refer to this new
column simply by using using ;-)
gnuplot supports the facilities provided by the
scanf-library. I used these to split up a column value
within a datapoint into several values, but I'm not sure,
wheter scanf is able to "look" a row above. Maybe you'd
like to ask gnuplots help about using and scanf.
Hope that helps
Lars
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