Dummy

By default, GNUPLOT assumes that the independent variable for the plot command line is x. x is called the dummy variable because it is just a notation to indicate the independent variable. The set dummy command changes this default dummy variable name. For example, you may find it more convenient to call the dummy variable t when plotting time functions:

        set dummy t
        plot sin(t), cos(t)

Syntax:

        set dummy <dummy-var>
        show dummy