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 line width and point size features, so these terminals obviously cannot fully support set linestyle.
Note that this feature is not completely installed; 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.