MATLAB: Extracting new matrix from existing matrix

Question

Hi all

I have matrix with 999*10

actually i have 10 feature of 999 images. now what i want is i want to extract features of some images in new matrix like i need the new matrix of 4,5,6 and 7 images among 999 images. my new matrix should be of size 4*10.

How can i do this please help me.

Answer 1

Try this:

rowsToKeep = [4, 5, 6, 7, 42];
extractedMatrix = originalMatrix(rowsToKeep , :);

Note: the rows to keep do not need to be consecutive. If they were though, you could do it in one line like this:

extractedMatrix = originalMatrix(4:7, :);