Re: Is that kind of substitution possible?

[Juergen W. <wie...@fr...>]

Hi,

>  gnuplot> alpha="3.51e-5"
>  gnuplot> beta="0.09400"
>  gnuplot> evie(alpha,beta)= `echo 90.0000  @alpha 0.00000  @beta  0.10000
> 1|./eviegompertz` gnuplot>print evie(alpha,beta)
>  4.230246
>
> where eviegompertz is a private C program which can't be simulated in
> gnuplot and just output a value.
>
> Now I want to just "splot evie(x,y)" where x and y are variables and not
> only fixed values. Is it possible to do it? I haven't seen such similar
> examples. It may be trivial, sorry.

Just use the system function:

alpha = 3.51e-5
beta  = 0.09400
evie(x, y) \
  = real(system("echo 90 %f 0 %f 0.1 1|./eviegompertz", x, y))
print evie(alpha, beta)

See "help functions system" for details.


Juergen