Xtics series

Syntax

    set xtics <incr>
    set xtics <start>, <incr>, <end>

The implicit start, incr, end form specifies that a series of tics will be plotted on the axis between the values start and end with an increment of incr. If end is not given, it is assumed to be infinity. The increment may be negative. If neither start nor end is given, start is assumed to be negative infinity, end is assumed to be positive infinity, and the tics will be drawn at integral multiples of incr. If the axis is logarithmic, the increment will be used as a multiplicative factor.

If you specify to a negative start or incr after a numerical value (e.g., rotate by angle or offset offset), the parser fails because it subtracts start or incr from that value. As a workaround, specify 0-start resp. 0-incr in that case.

Example:

     set xtics border offset 0,0.5 -5,1,5

Fails with 'invalid expression' at the last comma.

     set xtics border offset 0,0.5 0-5,1,5

or

     set xtics offset 0,0.5 border -5,1,5

Sets tics at the border, tics text with an offset of 0,0.5 characters, and sets the start, increment, and end to -5, 1, and 5, as requested.

The set grid options 'front', 'back' and 'layerdefault' affect the drawing order of the xtics, too.

Examples:

Make tics at 0, 0.5, 1, 1.5, ..., 9.5, 10.

     set xtics 0,.5,10

Make tics at ..., -10, -5, 0, 5, 10, ...

     set xtics 5

Make tics at 1, 100, 1e4, 1e6, 1e8.

     set logscale x; set xtics 1,100,1e8