hold on is not working?

I need to plot an image (using pcolor). On this image, the user has to select 2 points, which then have to be visualized. This is what I have so far:

 %plot image
        figure(1); pcolor(filtered); colormap(gray); shading interp; axis off; title('title'); axis equal tight;
        %get input
        hold on
        [x_in(1),y_in(1)] = ginput(1);
        p1 = plot(x_in(1),y_in(1),'b.');
        set(p1, 'Markersize',15);
        [x_in(2),y_in(2)] = ginput(1);
        p2 = plot(x_in(2),y_in(2),'g.');
        set(p2, 'Markersize',15); 
        hold off

Only problem: the points are not showing...what am i doing wrong?

Answer 1

[Image Analyst]

It's because you used pcolor for some reason. Use image() or imshow() and it will work fine. Is there some reason why you wanted to use pcolor (which rmeoves a row and column of your data) rather than a normal image display function?

[Bart]

Thank you for your response.

I already tried the image(), but it doesnt work with my data.

After flipping my data using flipud(), the imshow() works! only have to set the range.