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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: create custom command
Followup-To: comp.graphics.apps.gnuplot
Date: Thu, 04 Aug 2011 10:04:11 -0700
Organization: gnuplot development team
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sfeam wrote:

> 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)

Oops. Pay no attention to the example below.
I tried to simplify from a more complex example, but I cut out too much
so that as shown it cannot work.

> 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