Problem with axes handle.

I made a gui with a progressing plot in which i used a for loop. I want the plot to be in the axes ( with handle axes2 ) area which i defined in the gui. this is a part of my program:

for i=1:numel(B1)

axes(handles.axes2); 

plot(B1(1:i),B2(1:i),B1(i),B2(i),'*r');

axis([min(B1) max(B1) min(B2) max(B2)]);

end

but in this the loop only runs once and then i get an error saying

 'Error using axes Invalid object handle'.

please suggest me how to rectify it.

Thanks.

Answer 1

[Walter Roberson]

When you do not have "hold on" (or its internal equivalent) in effect, plot() does the equivalent of clf() [clear figure] which results in the axes being deleted as the axes is underneath the figure.

Are you trying to draw multiple plots in the same axes, beside each other? Or multiple plots that are visually on top of each other? Or are you wanting to draw one at a time to "animate" the plots? If you are animating, have a look at the drawnow() command.

[Siddharth]

i am trying to animate it by plotting one over another through the loop. this works perfectly if i use the figure handle of the gui for the plot but gives an error if i use the axes handle.

[Walter Roberson]

After the first axes() call, add

cla();
hold on

Then after the second axes() call, add

drawnow()

You might also want to add a pause() call.