vioravis wrote on 12/06/2011 12:42:35 PM:
> I am trying to code the following excel formula in R.
>
> a b c Result Formula
> 1 10 0.1 #N/A
> IF(B2<20,NA(),C2+IF(ISERROR(D1),0,D1))
> 2 20 0.2 0.2
> IF(B3<20,NA(),C3+IF(ISERROR(D2),0,D2))
> 3 30 0.3 0.5
> IF(B4<20,NA(),C4+IF(ISERROR(D3),0,D3))
> 4 40 0.4 0.9
> IF(B5<20,NA(),C5+IF(ISERROR(D4),0,D4))
> 5 50 0.5 1.4
> IF(B6<20,NA(),C6+IF(ISERROR(D5),0,D5))
> 6 60 0.6 2
> IF(B7<20,NA(),C7+IF(ISERROR(D6),0,D6))
> 7 70 0.7 2.7
> IF(B8<20,NA(),C8+IF(ISERROR(D7),0,D7))
> 8 80 0.8 3.5
> IF(B9<20,NA(),C9+IF(ISERROR(D8),0,D8))
> 9 90 0.9 4.4
> IF(B10<20,NA(),C10+IF(ISERROR(D9),0,D9))
> 10 100 1 5.4
> IF(B11<20,NA(),C11+IF(ISERROR(D10),0,D10))
>
>
> The variable "Result" is obtained using the excel formula shown next to
it.
> Column D contains the Result.
>
> dataFrame <- data.frame(a = seq(1:10),b = seq(10,100,by = 10),c =
> seq(0.1,1,by = 0.1))
>
> Can someone please help me as how to calculate the sequential sum in R
given
> by the excel formula??
>
> Thank you.
>
> Ravi
Try this:
d <- ifelse(dataFrame$b < 20, 0, dataFrame$c)
dataFrame$result <- cumsum(d)
dataFrame$result[dataFrame$b < 20] <- NA
Jean
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