ginput loop for my analysis

Question

So im trying to make a loop for my ginput in matlab, i have the following code:

    jpgFiles = dir('*.jpg');
numFiles = length(jpgFiles);
mydata = cell(1,numFiles);

% mydata = zeros(numFiles);
for k = 1:numFiles
    mydata{1,k} = imread(jpgFiles(k).name);
end
for k = 1:numFiles
%     subplot(4,5,k);
    figure;
    imshow(mydata{k});
    [x, y] = ginput(30)
end

and i would like to get [x, y] into a matrix 30x6 (30 points and 6 images) i have tryed making a for-loop and a function like xx=x(k) but i make it work. Can someone help me do that since it would save me a lot of time for my analysis. Im a newbie to matlab so hope you guys can help me since i can't seem to find a useable answer on matworks.com

Answer 1

Mikkel - rather than a 30x6 matrix of points, perhaps visualize it as a 30x2x6 three-dimensional matrix. Remember, that your x and y are 30x1 column arrays and so "putting" them together would give us a 30x2 matrix. And then for your six images, this would 30x2x6. Try the following

% initialize your array of coordinates
coords = zeros(30,2,numFiles);

for k=1:numFiles
    figure;
    imshow(mydata{k});
    [x, y] = ginput(30)
    coords(:,:,k) = [x y];
end

Try the above and see what happens!