for loop

this is my current code

mean(sum(abs(xw(:,:,3,10))-(xw(:,:,3,9))));

this can run and have value but this code could calculate tenth frame and ninth frame

but now, I must calculate the 100 frames that from fourth frame to 100th frames I know to use " for loop", but I can't write please tell me how to do

Answer 1

[Image Analyst]

Let's say that "k" is your for loop index. Then just say:

mean(sum(double(xw(:,:,3, k)) - double(xw(:,:,3, k-1))));

to get the mean column-by-column difference in the blue channels of your video frames.