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(gnuplot.info)linestyle

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Enter node , (file) or (file)node

 Each terminal has a default set of line and point types, which can be seen
 by using the command `test` (Note: test ).  set linestyle defines a set of
 line types and widths and point types and sizes so that you can refer to them
 later by an index instead of repeating all the information at each
 invocation.

 Syntax:
       set linestyle <index> {linetype | lt <line_type>}
                             {linewidth | lw <line_width>}
                             {pointtype | pt <point_type>}
                             {pointsize | ps <point_size>}
       set nolinestyle
       show linestyle

 The line and point types are taken from the default types for the terminal
 currently in use.  The line width and point size are multipliers for the
 default width and size (but note that <point_size> here is unaffected by
 the multiplier given on 'set pointsize').

 The defaults for the line and point types is the index.  The defaults for
 the width and size are both unity.

 Linestyles created by this mechanism do not replace the default styles;
 both may be used.

 Not all terminals support the `linewidth` (Note: linewidth ) and
  `pointsize` (Note: pointsize ) features; if not supported, the option will
 be ignored.

 Note that this feature is not completely implemented; linestyles defined by
 this mechanism may be used with 'plot', 'splot', 'replot', and 'set arrow',
 but not by other commands that allow the default index to be used, such as
 'set grid'.

 Example:
 Suppose that the default lines for indices 1, 2, and 3 are red, green, and
 blue, respectively, and the default point shapes for the same indices are a
 square, a cross, and a triangle, respectively.  Then

       set linestyle 1 lt 2 lw 2 pt 3 ps 0.5

 defines a new linestyle that is green and twice the default width and a new
 pointstyle that is a half-sized triangle.  The commands

       set function style lines
       plot f(x) lt 3, g(x) ls 1

 will create a plot of f(x) using the default blue line and a plot of g(x)
 using the user-defined wide green line.  Similarly the commands

       set function style linespoints
       plot p(x) lt 1 pt 3, q(x) ls 1

 will create a plot of f(x) using the default triangles connected by a red
 line and q(x) using small triangles connected by a green line.