Defining your own functions

Defining your own functions

In Gnuplot, you can define your own functions. Functions are defined using C programming-style definitions, with the same operators and C math library, functions, with the exception of the **, operator, which is the exponentiation. For your reference, a list of built-in functions and operators are provided here.

Here is an example of the definition of a sinc function. (The sinc function is defined as the sine of pi times x divided by pi times x, and is used typically in communications applications.)

sinc(x) = sin(pi * x) / (pi * x)

The value pi is a predefined value.