How can I combine two columns?

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

Answer 1

[Roger Stafford]

If M is your two-column matrix

 M = mean(M,2);

[Jan]

Equivalent:

M = sum(X, 2) * 0.5;

Answer 2

[David Sanchez]

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.

Answer 3

[Chetan Aswathanarayana]

If A = [5 9
        3 1
        1 7]

    >> B = A';
    >> B = mean(B);
    >> B = B'
    B =

         7
         2
         4