Syntax:
set xtics <incr>
set xtics <start>, <incr>, <end>
The implicit 4#4start5#5, 4#4incr5#5, 4#4end5#5 form specifies that a series of tics will
be plotted on the axis between the values 4#4start5#5 and 4#4end5#5 with an increment
of 4#4incr5#5. If 4#4end5#5 is not given, it is assumed to be infinity. The
increment may be negative. If neither 4#4start5#5 nor 4#4end5#5 is given, 4#4start5#5 is
assumed to be negative infinity, 4#4end5#5 is assumed to be positive infinity,
and the tics will be drawn at integral multiples of 4#4incr5#5. If the axis is
logarithmic, the increment will be used as a multiplicative factor.
If you specify to a negative 4#4start5#5 or 4#4incr5#5 after a numerical value
(e.g., rotate by 4#4angle5#5 or offset 4#4offset5#5), the parser fails because
it subtracts 4#4start5#5 or 4#4incr5#5 from that value. As a workaround, specify
0-4#4start5#5 resp. 0-4#4incr5#5 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