GNU Info

(gnuplot.info)smooth

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 `gnuplot` (Note: gnuplot ) includes a few general-purpose routines for
 interpolation and approximation of data; these are grouped under the `smooth`
 option.  More sophisticated data processing may be performed by preprocessing
 the data externally or by using `fit` (Note: fit ) with an appropriate
 model.

 Syntax:
       smooth {unique | csplines | acsplines | bezier | sbezier}

 `unique` (Note: unique ) plots the data after making them monotonic.  Each
 of the other routines uses the data to determine the coefficients of a
 continuous curve between the endpoints of the data.  This curve is then
 plotted in the same manner as a function, that is, by finding its value at
 uniform intervals along the abscissa (see `set samples` (Note: samples ))
 and connecting these points with straight line segments (if a line style is
 chosen).

 If `autoscale` (Note: autoscale ) is in effect, the ranges will be computed
 such that the plotted curve lies within the borders of the graph.

 If too few points are available to allow the selected option to be applied,
 an error message is produced.  The minimum number is one for `unique`, four
 for `acsplines` (Note: acsplines ), and three for the others.

 The `smooth` options have no effect on function plots.

acsplines

bezier

csplines

sbezier

unique