On Feb 5, 2012, at 5:30 PM, Philip Robinson wrote:
I have a vector of 2,1,0 I want to change to 0,1,2 respectively (the
data
is allele dosages)
I have tried multiple nested if/else statements and looked at the ?
if help
and cannot work out what is wrong, other people have posted code
which is
identical and they state works.
Any help would be greatly appreciated.
A[1:20]
[1] 1 1 0 0 1 0 1 0 1 0 0 0 1 1 0 1 1 1 0 0
B <- 2L - A
Or did I miss something in the problem statement?
B <- rep(NA,length(A))
for (i in 1:length(A)){ if(A[i]==2){B[i] <- 0} else
+ if(A[i]==0){B[i] <- 2} else
+ if(A[i]==1){B[i] <- 1}}
Error in if (A[i] == 2) { : missing value where TRUE/FALSE needed
You should look at ?if and ?ifelse more closely.
--
David Winsemius, MD
West Hartford, CT
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