MATLAB: Am I unable to use the ZOOM function to specify a region of interest in MATLAB 7.0 (R14)

areainterestMATLABofrectanglezoom

I would like to zoom into a particular area of an axes. However the ZOOM function does not have this functionality. How can I specify a region of the axes to zoom in to?

Best Answer

The ZOOM function is primarily used to control the interactive zoom mode, although it is possible to specify a zoom factor, as in the following example:

zoom(N)

The above code will zoom in by the factor N, and not turn the zoom mode on.

To specify a particular region of an axes to zoom into, use the AXIS command

 axis([xmin xmax ymin ymax])

or set the axes' XLim and YLim properties:

 set(gca,'XLim',[xmin xmax],'YLim',[ymin ymax])

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MATLAB: Are the resulting axes limits incorrect when I zoom in the MATLAB 7.0 (R14) figure using the zoom GUI plot tool

This bug has been fixed for Release 14 SP1 (R14SP1). For previous releases, please read below for any possible workarounds:

This has been verified as a bug in MATLAB 7.0 (R14) in the way that the zoom plot tool zooms in on regions that are very small.

Currently, to work around this issue, try using the SET function to specify the axes' limits. For example:

y = sin(2*pi*0.05*[1:24]);
plot(y,'r')

You can zoom in on the figure between x = 20 and x = 20.01 with the following code:

set(gca,'xlim',[20 20.01])

MATLAB: Is it possible to display XMinorTick marks only on the bottom axis of the plot and not the top in MATLAB 7.6 (R2008a)

The ability to hide the XMinorTick marks along the top or bottom of the axes is not available in MATLAB.

To work around this issue, you can use the RECTANGLE function to draw a box to cover the unwanted tick marks. You must manually specify the position of the rectangle to hide the tick marks. Please see the following example which assumes a white axes background color:

% create plot
stem(1:3,1:3);
axis([1 3 0 4]);
set(gca, 'XMinorTick', 'on');
% draw box to cover top ticks
hRect = rectangle('Position',[1.01 3.9 1.98 0.09]);
% change box colors to white
set(hRect,'EdgeColor','white','FaceColor','white');

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Related Solutions

MATLAB: Are the resulting axes limits incorrect when I zoom in the MATLAB 7.0 (R14) figure using the zoom GUI plot tool

MATLAB: Is it possible to display XMinorTick marks only on the bottom axis of the plot and not the top in MATLAB 7.6 (R2008a)

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