Re: Is that kind of substitution possible?

[Brouard N. <br...@in...>]

Le samedi 15 mars 2008 à 01:22 +0100, Juergen Wieferink a écrit :
> > Many thanks for your help, but I just got that:
> > gnuplot> evie(x, y) = real(system("echo 90 %f 0 %f 0.1
> > 1|./eviegompertz", x, y)) gnuplot> print evie(alpha,beta)
> > sh: 0.09400: command not found
> >
> > warning:  internal error--stack not empty!
> >           (function called with too many parameters?)
> > 0.0
> 
> Aaarg, sorry, there is an sprintf missing:
> 
> evie(x, y) = real(system(\
>   sprintf("echo 90 %f 0 %f 0.1 1|./eviegompertz", x, y)))
> 
> You can even make it more readable:
> 
> evie_cmd(x, y) = sprintf("echo 90 %f 0 %f 0.1 1|./eviegompertz", x, 
> y)
> evie(x, y) = real(system(evie_cmd(x, y)))
> 
> > gnuplot> help function system
> > Sorry, no help for 'function style system'
> > gnuplot>
> 
> help functions system
> 
> The 's' is crucial here.

That's the power of sprintf. Many thanks.
This is in the help:
  This can be used to import external functions into gnuplot using
  'f(x) = real(system(sprintf("somecommand %f",x)))'

It works with 4.2.

Thanks again for your help, it works fine.

> Juergen
> 
> 
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