Re: Any simple way to create for loops?

[Bastian M. <bma...@we...>]

There's also a patch on sourceforge which implements general scripting 
support with a language called Rexx.
(This had been only available on OS/2 previously).

In your case you could use the word() function and reread as follows, 
though:
In a file called sth. like main.gp do:

  # we use a string to simulate an array
  filenumbers = "0.01 0.1 1 2 3 10"
  # initialize loop counter
  index = 1
  # start loop
  load "loop.gp"

In loop.gp then do:

 # use filenumbers string as array
 i = word(filenumbers, index)

 # construct a new data pipe command
 command=sprintf("< ./script %s", i)

 filename=sprintf("name-%s.png", i)
 set output filename

 plot command using 1:3 with lines

 # increase loop counter
 index = index + 1
 # iterate
 if (index <= words(filenumbers)) reread


Not sure the above stuff is free of errors - I did not test it. But you 
should get the idea  for the looping bit... :)
I have not used strings with pipe commands before (the "< ./script" bit) 
so no guarantee that the plot command actually works.

Bastian

Mojca Miklavec schrieb:
> Hello,
>
> Is there some way to do something like this in gnuplot apart from
> using external script?
>
>     for [i in "0.01 0.1 1 2 3 10"]
>         filename=sprintf("name-%g.png", i)
>         command=sprintf("./script %g", i)
>         set output filename
>         plot command using 1:3 with lines
>     endfor
>
> I've read about reread, but I don't know how to apply it here except
> if gnuplot supports some array data structure which I think it doesn't
> (but maybe I'm wrong), or if I create a function with a long series of
>     f(x) = (x==1) ? 0.01 : (x==2) ? 0.1 : (x==3) ? 1 ...
> but in that case I would probably prefer to use external script for that.
>
> Thanks,
>    Mojca
>
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