Clearing a subplot array of images on a canvas of GUI

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Jason 2014-9-18

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评论： Geoff Hayes 2014-9-18

Hello. I am plotting a set of images whilst in a loop using subplot and its position vector method. In my loop, the values of x and y change. This all works fine and plots to the canvas in my GUI.

positionVector = [os+x, y, width, 0.05];
subplot('Position',positionVector);
hold off;

Does anyone know how to clear this array of images on the canvas??

Thanks Jason

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Geoff Hayes 2014-9-18

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Jason - do you wish to clear the image from each subplot, or remove the subplots from the canvas/figure?

One way (for either case) is to manage a list of the handles for each subplots

 hSubplots = [];
 for …
     % do stuff
     % position subplot
     positionVector = [os+x, y, width, 0.05];
     h = subplot('Position',positionVector);
     % update handle array
     hSubplots = [hSubplots ; h];
     hold off;
 end

Then to delete/remove the subplot from the figure, you would do

delete(hSubplots(k));

for each subplot k. Or if you'd rather just clear the contents from each subplot, use cla

cla(hSubplots(k),'reset');

for each subplot k.

Thanks Geoff (and Image Analyst). Hmmm, I don't store the h Subplots, so that's my mistake. I will add it to the handles structure. Just out of interest, the subplots I plot are persistent on the canvas so must be stored somewhere - is that true? Jason

Geoff Hayes 2014-9-18

Jason - see Image Analyst's comment to get the handles of all axes (subplots) on the figure. Their "information" is "stored" within the parent figure.

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