[R] create a vector looping over a frame
Siddique, Amer
Amer.Siddique at ssa.gov
Fri Jul 18 22:01:49 CEST 2003
Hello,
I have a data.frame
> names(popA)
[1] "Year" "Series" "Age" "WM" "WF" "HM" "HF" "BM"
[9] "BF" "IM" "IF" "AM" "AF" "Yr"
how do i loop over a subset of variables in this frame to create a vector of
length equal to the number of variables in the subset such that the vector's
ith element is the result of an aggregate fncn applied to the ith variable?
eg,
sumvar<-c(sum(WM),...,sum(AF))
if i try
for(i in 4:13){
sumVar<- sum(popA[,i])
sumVar2<-c(sumVar)
}
it returns
> sumVar2
[1] 287567
> length(sumVar2)
[1] 1
which is only the value at the last spot. i cant quite figure this simple
loop.
Thanks,
Amer Siddique
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