sum within the elements of a vector

Hello,

Suppose you have the following 1xn vector:

v=[(1,1),(1,2),...,(1,n)]

How the sum of the elements (each other) is calculated?

For example,

The sum of first element with the others

{[(1,1)+(1,2)} {(1,1)+(1,3)} {(1,1)+(1,4)} . . . {(1,1)+(1,n)}

The sum of second element with the others

{(1,2)+(1,3)} {(1,3)+(1,4)} . . . {(1,2)+(1,n)}

and so on.

The sum {(1,1)+(1,2)} is the same with the {(1,2)+(1,1)} and should only considered once.

Also the sum of an element with itself, shouldn`t be taken into account.

Thank you.

Best,

Pavlos

Answer 1

[Oleg Komarov]

v = 1:10;
out = bsxfun(@plus,v,v');

EDIT make diagonal elements = 0

[r,c] = size(out);
out(1:r+1:r*c) = 0;

[pavlos]

Thank you for your response.

My mistake: The sum between {(1,1)+(1,2)} and {(1,2)+(1,1)} should be considered,

while the sum of an element with itself should not .

That means that only the main diagonal of the matrix has zeros.

Any help please?

Thank you.

Best,

Pavlos

Answer 2

[Sean de Wolski]

Edit

x = 1:5;
M = bsxfun(@plus,x',x);
M(1:size(M,1)+1:end) = 0;

[pavlos]

That worked fine.

Thank you.

Best,

Pavlos