Fine control of the major (labelled) tics on the x axis is possible with the xtics command. The tics may be turned off with the xtics command, and may be turned on (the default state) with xtics. Similar commands control the major tics on the y, z, x2 and y2 axes.
Syntax:
set xtics {axis | border} {{no}mirror} {{no}rotate {by <ang>}} { autofreq | <incr> | <start>, <incr> {,<end>} | ({"<label>"} <pos> {<level>} {,{"<label>"}...) } { font "name{,<size>}" } { textcolor <colorspec> } unset xtics show xtics
The same syntax applies to ytics, ztics, x2tics, y2tics and cbtics.
`axis` or border tells `gnuplot` to put the tics (both the tics themselves and the accompanying labels) along the axis or the border, respectively. If the axis is very close to the border, the `axis` option will move the tic labels to outside the border. The relevant margin settings will usually be sized badly by the automatic layout algorithm in this case.
`mirror` tells `gnuplot` to put unlabelled tics at the same positions on the opposite border. `nomirror` does what you think it does.
`rotate` asks `gnuplot` to rotate the text through 90 degrees, which will be done if the terminal driver in use supports text rotation. `norotate` cancels this. `rotate by <ang>` asks for rotation by <ang> degrees, supported by some terminal types.
The defaults are `border mirror norotate` for tics on the x and y axes, and `border nomirror norotate` for tics on the x2 and y2 axes. For the z axis, the `{axis | border}` option is not available and the default is `nomirror`. If you do want to mirror the z-axis tics, you might want to create a bit more room for them with border.
xtics with no options restores the default border or axis if xtics are being displayed; otherwise it has no effect. Any previously specified tic frequency or position {and labels} are retained.
Positions of the tics are calculated automatically by default or if the `autofreq` option is given; otherwise they may be specified in either of two forms:
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.
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
The explicit ("<label>" <pos> <level>, ...) form allows arbitrary tic positions or non-numeric tic labels. In this form, the tics do not need to be listed in numerical order. Each tic has a position, optionally with a label. Note that the label is a string enclosed by quotes. It may be a constant string, such as "hello", may contain formatting information for converting the position into its label, such as "%3f clients", or may be empty, "". See `set format` for more information. If no string is given, the default label (numerical) is used.
An explicit tic mark has a third parameter, the "level". The default is level 0, a major tic. A level of 1 generates a minor tic. If the level is specified, then the label must also be supplied.
Examples:
set xtics ("low" 0, "medium" 50, "high" 100) set xtics (1,2,4,8,16,32,64,128,256,512,1024) set ytics ("bottom" 0, "" 10, "top" 20) set ytics ("bottom" 0, "" 10 1, "top" 20)
In the second example, all tics are labelled. In the third, only the end tics are labelled. In the fourth, the unlabeled tic is a minor tic.
However they are specified, tics will only be plotted when in range.
Format (or omission) of the tic labels is controlled by `set format`, unless the explicit text of a labels is included in the `set xtics (`<label>`)` form.
Minor (unlabelled) tics can be added by the mxtics command.
In case of timeseries data, position values must be given as quoted dates or times according to the format timefmt. If the <start>, <incr>, <end> form is used, <start> and <end> must be given according to timefmt, but <incr> must be in seconds. Times will be written out according to the format given on `set format`, however.
Examples:
set xdata time set timefmt "%d/%m" set format x "%b %d" set xrange ["01/12":"06/12"] set xtics "01/12", 172800, "05/12"
set xdata time set timefmt "%d/%m" set format x "%b %d" set xrange ["01/12":"06/12"] set xtics ("01/12", "" "03/12", "05/12")
Both of these will produce tics "Dec 1", "Dec 3", and "Dec 5", but in the second example the tic at "Dec 3" will be unlabelled.