The dummy command changes the default dummy variable names.
Syntax:
set dummy {<dummy-var>} {,<dummy-var>}
show dummy
By default, `gnuplot` assumes that the independent, or "dummy", variable for the `plot` command is "t" if in parametric or polar mode, or "x" otherwise. Similarly the independent variables for the `splot` command are "u" and "v" in parametric mode (`splot` cannot be used in polar mode), or "x" and "y" otherwise.
It may be more convenient to call a dummy variable by a more physically meaningful or conventional name. For example, when plotting time functions:
set dummy t
plot sin(t), cos(t)
At least one dummy variable must be set on the command; dummy by itself will generate an error message.
Examples:
set dummy u,v
set dummy ,s
The second example sets the second variable to s.