MATLAB: Gca function in matlab

gca

I have read the matlab docs but I don't understand what gca really does. Can somebody explain it to me? Thanks!

Best Answer

gca returns the handle to the current axis. - it generates one if there is no current axis.

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Use set command

Example

t=0:0.1:10;
y=sin(t);
plot(t,y);
set(gca,'xlim',[0 5])

With the new version of Matlab

h=gca
h.XLim=[0 5]

MATLAB: How to turn off GUI settings shwon in Command Window

The shown output is created by

set(handles.axes1);

See: help set:

A = set(H) 
set(H) 
returns or displays the names of the user-settable properties and 
their possible values for the object with handle H.

Omit this line, because it has no purpose at all. Most likely you want to do this instead:

axes(handles.axes1);

But this is not efficient. Changing the current axes is prone to bugs, because when the user clicks on an object during the processing, the current axes changes unexpectedly. Better define the parent property:

axis(handles.axes1, [0 x_max 0 y_max]);

By the way: You can use the debugger to find the line, which causes the output. Simply set some breakpoints in the code and step through the program line by line. Then it is obvious, when the output is created.

Best Answer

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MATLAB: GCA attributes axes changes

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