How can I combine two columns?

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Andrew
Andrew 2013-6-21
Hi I have a two column matrix. How can I merge and average them?
For example, if the matrix was
5 9
3 1
1 7
Then the output would be
7
2
4

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回答（3 个）

Roger Stafford
Roger Stafford 2013-6-21
If M is your two-column matrix
M = mean(M,2);
David Sanchez
David Sanchez 2013-6-21
Use the built-ibn function cat:
a = [1 2; 3 4];
b1 = [2 4];
b2 = [2; 4];
c1 = cat(1,a,b1);
c2 = cat(2,a,b2);
>> c1
c1 =
1 2
3 4
2 4
>> c2
c2 =
1 2 2
3 4 4
read
help cat
for more options.
Chetan Aswathanarayana
编辑：Chetan Aswathanarayana 2013-6-21
If A = [5 9
3 1
1 7]
>> B = A';
>> B = mean(B);
>> B = B'
B =
7
2
4

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