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 <- 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

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