Hi,

was wondering if exists a tip so that is possible to use the Summation symbol with the constraints to sum i from 0 to n but selecting just even(odd) values in the sequence of the i index .

Hope that I was able to explain correctly what I mean.

Bests Regards

Francesco

Hello Francesco,

I am not quite sure if this is like something you wanted:
[MATH=eng]n←13[/MATH]
[MATH=eng]sum(el(x,2*i),i,1,round({n-1}/2,0))—el(x,2)+el(x,4)+el(x,6)+el(x,8)+el(x,10)+el(x,12)[/MATH]
[MATH=eng]sum(el(x,2*i+1),i,0,round(n/2-1,0))—el(x,1)+el(x,3)+el(x,5)+el(x,7)+el(x,9)+el(x,11)+el(x,13)[/MATH]

Regards,
Radovan

Hi Radovan,

yes this is what I mean; your one is really a smart approach.

Thanks a lot for your answer.

Francesco

You are welcome Francesco

I am glad to be of any assistance.

Regards,
Radovan