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(gnuplot.info)autoscale

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 Autoscaling may be set individually on the x, y or z axis or globally on all
 axes. The default is to autoscale all axes.

 Syntax:
       set autoscale {<axes>{min|max}}
       set noautoscale {<axes>{min|max}}
       show autoscale

 where <axes> is either `x`, `y`, `z`, `x2`, `y2` or `xy`.  A keyword with
 `min` or `max` appended (this cannot be done with `xy`) tells `gnuplot`
 (Note: gnuplot ) to autoscale just the minimum or maximum of that axis.  If
 no keyword is given, all axes are autoscaled.

 When autoscaling, the axis range is automatically computed and the dependent
 axis (y for a `plot` (Note: plot ) and z for  `splot` (Note: splot )) is
 scaled to include the range of the function or data being plotted.

 If autoscaling of the dependent axis (y or z) is not set, the current y or z
 range is used.

 Autoscaling the independent variables (x for `plot` and x,y for `splot`) is a
 request to set the domain to match any data file being plotted.  If there are
 no data files, autoscaling an independent variable has no effect.  In other
 words, in the absence of a data file, functions alone do not affect the x
 range (or the y range if plotting z = f(x,y)).

 Please see `set xrange` (Note: xrange ) for additional information about
 ranges.

 The behavior of autoscaling remains consistent in parametric mode, (see `set
 parametric`).  However, there are more dependent variables and hence more
 control over x, y, and z axis scales.  In parametric mode, the independent or
 dummy variable is t for `plot`s and u,v for `splot`s.  `autoscale` in
 parametric mode, then, controls all ranges (t, u, v, x, y, and z) and allows
 x, y, and z to be fully autoscaled.

 Autoscaling works the same way for polar mode as it does for parametric mode
 for `plot`, with the extension that in polar mode `set dummy` (Note: dummy )
 can be used to change the independent variable from t (see `set dummy`).

 When tics are displayed on second axes but no plot has been specified for
 those axes, x2range and y2range are inherited from xrange and yrange.  This
 is done _before_ xrange and yrange are autoextended to a whole number of
 tics, which can cause unexpected results.

 Examples:

 This sets autoscaling of the y axis (other axes are not affected):
       set autoscale y

 This sets autoscaling only for the minimum of the y axis (the maximum of the
 y axis and the other axes are not affected):
       set autoscale ymin

 This sets autoscaling of the x and y axes:
       set autoscale xy

 This sets autoscaling of the x, y, z, x2 and y2 axes:
       set autoscale

 This disables autoscaling of the x, y, z, x2 and y2 axes:
       set noautoscale

 This disables autoscaling of the z axis only:
       set noautoscale z

parametric mode

polar mode