[R] condition in triple summation

[Sherouk Moawad]

| If for example I have a double sammation on (xj+xi)The first summation from 1 to 3 And second summation is from 1 to 2If I put the condition of (i>j ) then the term (x1+x1) will not be included I need to cut the condition into tow parts If i&j>1 then i>jWhile if i=1 then i>=jSo that the term (x1+x1) is includedCan this be done or it's an imaginary casePlease help |

 


     On Monday, October 19, 2015 4:00 PM, jim holtman <jholtman at gmail.com> wrote:
   

 Not sure I understand what your condition 'i > j > k' means in the context of where each of the values is 1:3.  The only value that meets that condition is i =3, j=2 & k=1, but you said exclude any cases where the values were equal to 1.
Can you clarify with an example what you mean.

Jim Holtman
Data Munger Guru
 
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
On Mon, Oct 19, 2015 at 3:53 AM, Sherouk Moawad via R-help <r-help at r-project.org> wrote:

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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