Extracting new matrix from existing matrix

2012 9 3
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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.

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Image Analyst
Image Analyst 2012-9-3
编辑：Image Analyst 2012-9-3

1 个投票

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, :);

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