How to refer to multiple separate columns?

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Synthia Caruvana 2019-2-20

编辑： KSSV 2019-2-20

B =
  12     9     6     3
   4     6     8    10
  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!

KSSV 2019-2-20

编辑：KSSV 2019-2-20

B(:,[1 3])

B(:,1:2:3)

Or, USe logicals

idx = logical([1 0 1]) ;
B(:,idx)

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