Re: [Gnuplot-info] avoid double function evaluation on '+' special file

[Ethan M. <eam...@gm...>]

On Sun, Apr 21, 2024 at 6:31 AM <fi...@ig...> wrote:

> Dear Gnuplot Users,
>
> suppose the following simple gnuplot example snippet which is used to
> plot a complex valued function:
>
>    w = 5
>    r = 3
>    f(t) = r * exp(I * w * t)
>    plot sample [t=0:1] '+' u (real(f(t))):(imag(f(t))) w l
>
> here the function f(t) is evaluated twice - not desirable because of
> performance. How can this be done with only one evaluation of f(t)?
>

    plot sample [t=0:1] '+' u (temp=f(t),real(temp)):(imag(temp)) w l


>
> Thanks for any advice and best regards
>
> Torsten
>