MATLAB: Taking every nth element from each column in a matrix

extraction

Hello,
I have a 10×5 matrix:
A = randi(10,10,5);
A =
     2     8     7     1     4
     9     8     8     1     7
     4     8     2     8     8
     3     3     2    10     6
     8     7     6     7     8
     1     6     5     2     3
     1     4     9     8     8
     7     1     8     2    10
     7     8     8     2     9
     6     4     1     7     1
I would like to make another matrix (B) that contains every 2nd element from each column of A, such that
B =
     9     8     8     1     7
     3     3     2    10     6
     1     6     5     2     3
     7     1     8     2    10
     6     4     1     7     1
Thank you.

Best Answer

Henry - try grabbing every other row as
 B = A(2:2:end,:);
In the above we use 2:2:end to start at row two and consider every other row thereafter (with the second 2) until we reach the end of the rows. The second parameter, :, indicates that we want all column data.
Try the above and see what happens!
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