Re: simple (not for me) operation on matrix

[Quentin Spencer]

Here's a quick solution, but there may be a more efficient way that
avoids the FOR loop using something like 'reshape':

N = size(big_matrix,1);

for n = 1:N/2
    new_matrix(n,:) = sum(big_matrix([n*2-1,n*2],:));
end




Paolo Ariano wrote:

> hi *
>
> ive a big matrix (750 cols* 140 rows) for example:
>
> 1 2 3 2 4 5 6
> 3 4 6 5 3 2 1
> 2 4 5 6 7 8 8
> 6 7 5 4 3 2 1
>
> i need to obtain a new matrix where i sum line 1 and line 2, then line 3
> and line 4 and so on as:
>
> (1+3) (2+4)
> (2+6) (4+7)
>
> i'm coming crazy for such a simple thing, any idea ?
>
> thanks
> paolo
>  





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