Only saving one iteration of the for loop is being saved to the file, but I need all the iterations to be saved to the file.

The code works well, however, only one iteration of my for loop is being saved into the tiff file. When I open the .tiff there are only 30 images. I am not sure if this error is because the for loop is overwriting the first 30 images every time it iterates, or if the way that I am saving my images, that when they save, the first thirty are being written over by the second iteration. Possibly I am using the wrong trigger event?

 Below is my code

 vid = videoinput('hamamatsu', 1, 'MONO16_BIN4x4_512x512_FastMode');
  src = getselectedsource(vid);
  %vid.FramesPerTrigger = 10;
  % TriggerRepeat is zero based and is always one
  % less than the number of triggers.

%vid.TriggerRepeat = 2;

src.ExposureTime = .3;
%when I want to take multiple images, wait awhile and then takee more
%images in the same file. 

for i = 1:2
    tic
    vid.FramesPerTrigger = 30;
    fprintf(obj, 'O 0 1'); %on
    preview(vid);
    %fprintf(obj, 'O 0 1'); %on
    start(vid),wait(vid);
    toc

       for l = 1:2
           fprintf(obj, 'O 0 0'); %off 
           pause (10);
       end;

end;
stoppreview(vid);
stop(vid);

alpha = input('What do you want to name you file? ','s');
x = getdata(vid);
filename = [alpha '.tif'];
for slnum = i : size(x, 4)
  if slnum == i; mode = 'overwrite'; else mode = 'append'; end
  imwrite( x(:,:,slnum), filename, 'writemode', mode);

end

closepreview(vid);
delete(vid); 
clear vid;

[Greg]

x is 4 dimensional, and your loop variable is the 4th dimension. Then you use it as a 3rd dimension index. Does it behave better if you change it to:

imwrite(x(:,:,:,slnum), ...);

[Merrilee Thomas]

No, I already tried that. sorry. Thanks tho.

[Greg]

What does size(x) return?