Re: [Gnuplot-info] Plotting ratio of i- and j-th columns, i and j changing

[Hans-Bernhard B. <HBB...@t-...>]

On 07.08.2010 22:24, LukasP wrote:

> I have a datafile. I need to plot ratio of two columns, but selection of the
> columns depends on variable KEY, which is passed to the plotting script.

You'll probably need the long form of a column data reference, 
column(<n>), instead of the short $<n>, for that.

> plot "IFs/ILs/Res/L31-" . WHAT . EXT . ".xF3" u 1:($3/$2) w lp t "CEN-L31"
>
> but with "$3" and "$2" are varying (or are depending on the KEY variable).

Varying / depending: how?

> Is there a way how to get the ratio of the columns, depending on a variable
> (KEY)? Maybe using macros, eval?

You're trying too hard.  You need something like

	using 1:(column(KEY+1)/column(KEY))

> And another question -
> - Is it possible to "continue" plotting?

Not really.  But you're probably looking for "help replot".

> This would help me plotting two columns of a datafile, that plotting ratios
> of two its columns.

No, it won't.