MATLAB Functions

Axis scaling and appearance

axis([xmin xmax ymin ymax])
axis([xmin xmax ymin ymax zmin zmax])
axis auto
axis manual
axis(axis)
v = axis

axis ij
axis xy

axis square
axis equal
axis normal
axis image

axis vis3d

axis off
axis on

[mode,visibility,direction] = axis('state')

Description

axis manipulates commonly used Axes properties. (See Algorithm section.)

axis([xmin xmax ymin ymax])

sets the limits for the x- and y-axis of the current Axes.

axis([xmin xmax ymin ymax zmin zmax])

sets the limits for the x-, y-, and z-axis of the current Axes.

axis auto

sets MATLAB to its default behavior of computing the current Axes' limits automatically, based on the minimum and maximum values of x, y, and z data. You can restrict this automatic behavior to a specific axis. For example, axis 'auto x' computes only the x-axis limits automatically; axis 'auto yz' computes the y- and z-axis limits automatically.

axis manual and axis(axis)

freeze the scaling at the current limits, so that if hold is on, subsequent plots use the same limits. This sets the XLimMode, YLimMode, and ZLimMode properties to manual.

v = axis

returns a row vector containing scaling factors for the x-, y-, and z-axis. v has four or six components depending on whether the current Axes is 2-D or 3-D, respectively. The returned values are the current Axes' XLim, Ylim, and ZLim properties.

axis ij

places the coordinate system origin in the upper-left corner. The i-axis is vertical, with values increasing from top to bottom. The j-axis is horizontal with values increasing from left to right.

axis xy

draws the graph in the default Cartesian axes format with the coordinate system origin in the lower-left corner. The x-axis is horizontal with values increasing from left to right. The y-axis is vertical with values increasing from bottom to top.

axis square

makes the current Axes region square (or cubed when three-dimensional). MATLAB adjusts the x-axis, y-axis, and z-axis so that they have equal lengths and adjusts the increments between data units accordingly.

axis equal

sets the aspect ratio so that the data units are the same in every direction. The aspect ratio of the x-, y-, and z-axis is adjusted automatically according to the range of data units in the x, y, and z directions.

axis vis3

freezes aspect ratio properties to enable rotation of 3-D objects and overrides stretch-to-fill.

axis normal

automatically adjusts the aspect ratio of the Axes and the aspect ratio of the data units represented on the Axes to fill the plot box.

axis tightequal

sets the aspect ratio so that the data units are the same in every direction. This differs from axis equal because the plot box aspect ratio automatically adjusts. (Formally axis image.)

axis off

turns off all axis lines, tick marks, and labels.

axis on

turns on all axis lines, tick marks, and labels.

[mode,visibility,direction] = axis('state')

returns three strings indicating the current setting of Axes properties:


`Output Argument`	`Strings Returned`
`mode`	`'auto' \| 'manual'`
`visibility`	`'on' \| 'off'`
`direction`	`'xy' \| 'ij'`

mode is 'auto' if XLimMode, YLimMode, and ZLimMode are all set to auto. If XLimMode, YLimMode, or ZLimMode is manual, mode is 'manual'.

Examples

The statements

x = 0:.01:pi/2;
plot(x,tan(x))

use the automatic scaling of the y-axis based on ymax = tan(1.57), which is well over 1000, as shown in the left figure.

The right figure shows a more satisfactory plot after typing

axis([0  pi/2  0  10])

Algorithm

When you specify minimum and maximum values for the x-, y-, and z-axes, axis sets the XLim, Ylim, and ZLim properties for the current Axes to the respective minimum and maximum values in the argument list. Additionally, the XLimMode, YLimMode, and ZLimMode properties for the current Axes are set to manual.

axis auto sets the current Axes' XLimMode, YLimMode, and ZLimMode properties to 'auto'.

axis manual sets the current Axes' XLimMode, YLimMode, and ZLimMode properties to 'manual'.

The following table shows the values of the Axes properties set by axis equal,
axis normal, axis square, and axis image.


`Axes Property`	`axis equal`	`axis normal`	`axis square`	`axis tightequal`
`DataAspectRatio`	`[1 1 1]`	`not set`	`not set`	`[1 1 1]`
`DataAspectRatioMode`	`manual`	`auto`	`auto`	`manual`
`PlotBoxAspectRatio`	`[3 4 4]`	`not set`	`[1 1 1]`	`auto`
`PlotBoxAspectRatioMode`	`manual`	`auto`	`manual`	`auto`
`Stretch-to-fill`	`disabled`	`active`	`disabled`	`disabled`