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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: create custom command
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Date: Thu, 04 Aug 2011 08:51:26 -0700
Organization: gnuplot development team
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francesco lucci wrote:

> Hi all,
> I have a gnuplot script A that sets some standard parameters (i.e.
> legends, line types, slabx = input for index parameter etc)
> and loads scripts Bx that set other parameters (i.e. datafile = file
> data to be plot,  var = variable to be plot)
> and load another scrip C that simply performs the plotting command:
> 
------------------------------------------------------------------------------------------------------
-----------------------
>  plot datafile using 1:(sqrt(column(var))) index slab1  title name1 w
> l ls 1, \
>      datafile using 1:(sqrt(column(var))) index slab2  title name2 w l
> ls 2, \
>      datafile using 1:(sqrt(column(var))) index slab3  title name3 w l
> ls 3, \
>      datafile using 1:(sqrt(column(var))) index slab4  title name4 w l
> ls 4
> 
------------------------------------------------------------------------------------------------------
----------------------
> everything work fine and I generate 10s of plots just by calling
> (gnuplot 'A').
> 
> But if I want to plot more sections ('index slabx') i have to change
> both A and the C scripts.
> ( and ofcourse i have to manage too many scripts ...)
> 
> I was wondering if it was possible to define directely the plot
> command of script C in script A.
> So i can have 1 set of scripts less and the only change i have to do
> to B is to replace
>  < load 'C' > with < Newcommand> (or similar).

There are several ways you could do this in version 4.4, and even
more if you are using the development version.

In version 4.4  using macros
script A:
    command_options = " index slab1  title name1 w l ls 1"
    load "C"
script C:
    set macros
    plot datafile using 1:(sqrt(column(var))) @command_options

In version 4.4 using eval()
script A:
    plot_command = "plot ...."
    load "C"
script C:
    eval(plot_command)

In version 4.5 using iteration
script A:
    indices = "slab1 slab3 slab6"
    load "C"
script C:
    plot for [i in indices] datafile using 1:(f(var)) index i


See "help macros"  "help eval"  "help iteration"


> 
> Any idea.
> 
> thank you everybody for any suggestion.
> francesco