Plot a column from an array by clicking on an image of that array

Say I have an array an image of which I can display:

ti = magic(32);
figure(1);
imagesc(ti);

I want to be able to click on a pixel in the image frame and have a plot updated to show the column from the original array that includes that pixel.

while 1
    figure(1);
    [x,y] = ginput;
    figure(2);
    plot(ti(:,round(x)));
end

Except that this doesn't work.

What I really want is a tool in an image figure which plots the columnar profile if I click the tool on the image.

Thanks.

Answer 1

[Image Analyst]

Try this:

ti = magic(32);
subplot(2, 1, 1);
imshow(ti, [], 'InitialMagnification', 1000)
g = gcf;
g.WindowState = 'maximized';
buttonText = 'OK';
while strcmpi(buttonText, 'OK')
    subplot(2, 1, 1);
    promptMessage = sprintf('Click a point');
    titleBarCaption = 'Continue?';
    buttonText = questdlg(promptMessage, titleBarCaption, 'OK', 'Quit', 'OK');
    if contains(buttonText, 'Quit', 'IgnoreCase', true)
        return; % or break or continue.
    end
    [x, y] = ginput(1);
    column = round(x);
    thisColumn = ti(:, column);
    subplot(2, 1, 2);
    plot(thisColumn, 'b-', 'LineWidth', 2);
    grid on;
    caption = sprintf('Column %d', column);
    title(caption, 'FontSize', 16)
    xlabel('Row', 'FontSize', 16)
    ylabel('Value', 'FontSize', 16)
end