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How do you find the average of specific columns for all rows?

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Anonymous Matrix
Anonymous Matrix 2017-2-21
评论： Anonymous Matrix 2017-2-21
say like I have this 2D matrix
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22 23 24
how do I find the average/mean for all of the rows but only for columns 1,2, and 6?

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Jos (10584)
Jos (10584) 2017-2-21
Select the columns, and then perform the operation:
A = magic(6)
B = A(:,[1 2 6])
meanVal = mean(B,2)

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