about mouse button click

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Hi guys: I'm using ginput(1) function to select the pixels position in a few images, however, the number of clicks are different for each image, so I hope to stop selecting pixels by clicking the right key on the mouse and count how many clicks I made for each image. How can I do that? thank you very much.

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UTA 2013-5-17

在 MATLAB Online 中打开

      button = 1;
      n = 0;
      while (button == 1)
          [x,y,button] = ginput(1);
          if (button == 1)
               n = n + 1;
              X = [X ,x];
              Y = [Y ,y];
              hold on
              plot(x,y,'+r'); 
          end
      end