Error in XData=get(​get(gca,'c​hildren'),​'XData)

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Ean Soo
Ean Soo 2011-3-19
Hie guys, i have an error with the command above.
XData=get(get(gca,'children'),'XData');
YData=get(get(gca,'children'),'YData');
y_BPFO = interp1(XData,YData,BPFO);
I used this codes in my GUI. It works well when i have 1 axes in my GUI. But when i have 2 axes, it prompt me this error log,
??? Error using ==> interp1 at 121
X must be a vector.
Error in ==> maingui>updateAxes at 130
y_BPFO = interp1(XData,YData,BPFO);
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> maingui at 42
gui_mainfcn(gui_State, varargin{:});
??? Error while evaluating uicontrol Callback

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Paulo Silva
Paulo Silva 2011-3-19
Instead of gca you should use the handle for the axes that contains the data you want.
If you really want to use gca you can choose what's the current axes before, example:
axes(handles.axes2);
Your code doesn't ensure that there are children and that they contain useful data for interp1.
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Ean Soo
Ean Soo 2011-3-19
Hie there, can i know if this command correct?
y=get(handles.axes3,'ylim');
plot(handles.axes3,[BPFI BPFI],y,'-r');
Paulo Silva
Paulo Silva 2011-3-19
y=get(handles.axes3,'ylim');
axes(handles.axes3); %make axes3 the current axes
line([BPFI BPFI],y,'LineStyle','--','Color',[1 0 0]) %draw the line

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