Generating random blocks of 7-by-7 pixels from a multidimensional array 700 x 800 x 6.

Hi, I am new in the programming field and encounter a problem while coding to generate 100 random blocks of 7x7 pixels from a multidimensional array with a size of 700x800x6.Any help in this regard will be highly appreciated

Answer 1

[Walter Roberson]

Easy way: loop

Trickier way:

See https://www.mathworks.com/matlabcentral/answers/348465-hello-been-trying-to-extract-array-from-a-big-matrix-so-because-of-that-taken-magic-5-but-issue-is#comment_468693 and https://www.mathworks.com/matlabcentral/answers/348500-extracting-last-non-nan-200-columns-from-matrix-with-varying-number-of-nans-ending-the-rows#answer_273971 where I show how to extract different columns for each row.

[Chandrama Sarker]

Thanks, Walter, I will try in a trikier way. I have tried the loop for it but found it a bit complicated as my knowledge in this field is very new. I will let you know how far I will go with my next try.

[Walter Roberson]

The trickier way is not recommended for beginners!

for K = 1 : 100
  r = randi(700-6,1,1);
  c = randi(800-6,1,1);
  rb{K} = YourData(r:r+6, c:c+6, :);
end