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(gnuplot.info)parametric mode

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 When in parametric mode (`set parametric` (Note: parametric )), the xrange
 is as fully scalable as the y range.  In other words, in parametric mode the x
 axis can be automatically scaled to fit the range of the parametric function
 that is being plotted.  Of course, the y axis can also be automatically scaled
 just as in the non-parametric case.  If autoscaling on the x axis is not set,
 the current x range is used.

 Data files are plotted the same in parametric and non-parametric mode.
 However, there is a difference in mixed function and data plots: in
 non-parametric mode with autoscaled x, the x range of the datafile controls
 the x range of the functions; in parametric mode it has no influence.

 For completeness a last command `set autoscale t` is accepted.  However, the
 effect of this "scaling" is very minor.  When `gnuplot` (Note: gnuplot )
 determines that the t range would be empty, it makes a small adjustment if
 autoscaling is true. Otherwise, `gnuplot` gives an error.  Such behavior may,
 in fact, not be very useful and the command `set autoscale t` is certainly
 questionable.

 `splot` (Note: splot ) extends the above ideas as you would expect.  If
 autoscaling is set, then x, y, and z ranges are computed and each axis scaled
 to fit the resulting data.