> -----Original Message-----
> testseq<-seq(1:20)
> testchange<-ifelse(testseq<=4,'x',testseq)
> testchange<-c(ifelse(testseq<=4,'x',testseq),ifelse(testseq>=5,'y',testseq))
>
> The last instruction causes the vector 'testchange' to change dimensions,
Of course it does. ifelse(test, yes, no) returns a vector of length
length(test). Your last line concatenates two of them, so you'll get a vector
of length 40.
You might also want to note that you are replacing numbers with character
strings, so
ifelse(testseq<=4,'x',testseq)
will return four 'x's and then - because R has to coerce everything to a single
type - character representations of numbers 5:20. That will not then respond
well to subsequent numeric comparisons ...
S Ellison
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