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Summation ..is possible to summ for values of i even ( odd )?
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Offline frapuano  
#1 Posted : 29 November 2010 16:18:58(UTC)
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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
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Offline omorr  
#2 Posted : 29 November 2010 20:26:41(UTC)
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Hello Francesco,

I am not quite sure if this is like something you wanted:
n←13
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)
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)

Regards,
Radovan
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Offline frapuano  
#3 Posted : 29 November 2010 22:22:29(UTC)
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Hi Radovan,

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

Thanks a lot for your answer.

Francesco
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Offline omorr  
#4 Posted : 29 November 2010 22:57:34(UTC)
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You are welcome Francesco Good

I am glad to be of any assistance.

Regards,
Radovan
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