MATLAB: How to refer to multiple separate columns

columnsmatrices

B =
    15    12     9     6     3
     2     4     6     8    10
     6    12    18    24    30
How do I refer to columns 1 and 3? I know that:
ans = B(:,1:3)
will give me columns 1 through 3, but how do I get just columns 1 and 3 without column 2 in the middle? Thanks!

Best Answer

B(:,[1 3])
Or
B(:,1:2:3)
Or, USe logicals
idx = logical([1 0 1]) ;
B(:,idx)
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