try

index=1:size(log_data,'r')-1;
energy=(log_data(index+1,1)-log_data(index,1)).*log_data(index,2).*log_data(index,3);

Best wishes,

Jasper.



On 8/1/2017 13:00, Richard llom wrote:
> Hello All,
> I have this for loop:
> for i=1:size(log_data,'r')-1
>     energy(i)=(log_data(i+1,1)-log_data(i,1))*log_data(i,2)*log_data(i,3);
> end
>
> The rows / loopsize are only a couple of thousands, so it is not that big of
> deal, still I was wondering: It is possible to do this w/o a loop?
>
> cheers
>
>
>
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