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3.15.6 functions

Built-in or user-defined functions can be displayed by the `plot` and `splot` commands in addition to, or instead of, data read from a file. The requested function is evaluated by sampling at regular intervals spanning the independent axis range[s]. See samples and isosamples. Example:

           approx(ang) = ang - ang**3 / (3*2)
           plot sin(x) title "sin(x)", approx(x) title "approximation"
     

To set a default plot style for functions, see `set style function`. For information on built-in functions, see functions. For information on defining your own functions, see `user-defined`.