Dear R Experts
that's my original equation
> x=c(2,4)
> Y1=sum(sapply(1:2,function(i){sum(sapply(1:i,function(j){(3^(x[i]+x[j]))}))}))
>
> y1
[1] 7371
I want to write the inside function (3^(x[i]+x[j])) in a more condensed form
cause this will help me when the multiple summations are more than two
I've tried the following form
> y2=sum(sapply(1:2,function(i){sum(sapply(1:i,function(j){(3^(sum(sapply(i:j,function(l){x[l]}))))}))}))
>
> y2
[1] 819
But it didn't work, it gave another solution
Any help or recommendations
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