[R] condition in triple summation

Sherouk Moawad sheroukmoawad at yahoo.com
Mon Oct 19 09:53:45 CEST 2015


If I'm summing over (i,j,k) each from 1 to 3

And I have  condition that (i>j>k)

But I want to restrict this condition to only cases where i,j,k>1

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From:"Jeff Newmiller" <jdnewmil at dcn.davis.CA.us>
Date:Mon, Oct 19, 2015 at 1:24 AM
Subject:Re: [R] condition in triple summation

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On October 18, 2015 2:03:34 PM PDT, Sherouk Moawad via R-help <r-help at r-project.org> wrote:
>Dear R-Expertsx=c(0,0.3, 0.5,0.6)sum(sapply(1:4, function(i)
>{sum(sapply(1:3, function(j){sum(sapply(1:2, function(k)
>{(i>j)*(j>k)*exp(x[i]+x[j]+x[k])}))}))}))
>I want to restrict the condition (i>j>k) to only those cases where
>i>1&j>1&k>1In other words'if i=1 then i>=jif j=1 then j>=kother wise
>i>j>kcan this be done using coding or notThank you 
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>
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