avoid double function evaluation on '+' special file

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)?


Thanks for any advice and best regards


Torsten


-- 
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Torsten Finke
[email protected]
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