Axis scaling and appearance
axis([xmin xmax ymin ymax])
axis([xmin xmax ymin ymax zmin zmax cmin cmax])
v = axis
[mode,visibility,direction] = axis('state')
axis manipulates commonly used axes properties. (See Algorithm section.)
axis([xmin xmax ymin ymax zmin zmax cmin cmax]) sets the x-, y-, and z-axis limits and the color scaling limits (see caxis) of the current axes.
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 auto sets MATLAB® default behavior to compute 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 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 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 square makes the current axes region square (or cubed when three-dimensional). This option adjusts the x-axis, y-axis, and z-axis so that they have equal lengths and adjusts the increments between data units accordingly.
h1 = subplot(221); h2 = subplot(222); axis([h1 h2],'square')
set both axes to square.
mode is auto if XLimMode, YLimMode, and ZLimMode are all set to auto. If XLimMode, YLimMode, or ZLimMode is manual, mode is manual.
Keywords to axis can be combined, separated by a space (e.g., axis tight equal). These are evaluated from left to right, so subsequent keywords can overwrite properties set by prior ones.
x = 0:.01:pi/2; plot(x,tan(x),'-ro')
use the automatic scaling of the y-axis based on ymax = tan(1.57), which is well over 1000:
The following figure shows a more satisfactory plot after typing
axis([0 pi/2 0 5])
You can create an axes (and a figure for it) if none exists with the axis command. However, if you specify non-default limits or formatting for the axes when doing this, such as [4 8 2 9], square, equal, or image, the property is ignored because there are no axis limits to adjust in the absence of plotted data. To use axis in this manner, you can set hold on to keep preset axes limits from being overridden.
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 or Behavior