MATLAB: Clear a line drawn in plot.

MATLABplot

Hello I would like to clear a line that I draw in my graph but I want it to be clean only when I run my function.

When I press button in Matlab GUI I want to draw a line but when I pressed it second time I want to clear that line and draw other. How to simply do this.

Best Answer

Implement this in the pushbutton:

children = get(gca, 'children');
delete(children(1));

The first line grabs the last additions to the figure, the second line deletes from the plot the last element added to the figure.

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function undo_callbacks (hObject, eventdata, handles)
scatitem = handles.scatitem;
number_to_delete = 3;   %for example
delete(scatitem(1:number_to_delete))
scatitem(1:number_to_delete) = [];
handles.scatitem = scatitem;
guidata(hObject, handles);
end

If you only want to undo one per call, change the 3 to 1.

The difference compared to your code is that my code updates handles.scatitem . You were trying to delete the same child every time

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Best Answer

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