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(gnuplot.info)dummy

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 The `set dummy` command changes the default dummy variable names.

 Syntax:
       set dummy {<dummy-var>} {,<dummy-var>}
       show dummy

 By default, `gnuplot` (Note: gnuplot ) assumes that the independent, or
 "dummy", variable for the `plot` (Note: plot ) command is "t" if in
 parametric or polar mode, or "x" otherwise. Similarly the independent
 variables for the `splot` (Note: 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; `set 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.