On Mar 26, 2014, at 11:34 AM, Si Qi L. wrote:
> Hi, I have got a problem with dummy coding and I really couldn't figure it
> out. Would you please help me out? this is my codes:
>
> idx<-sort(unique(Employment.time$V1));
> dummy <- matrix(NA, nrow=nrow(Employment.time), ncol= length(idx))
>
> for (i in 1:nrow(Employment.time)) {
>
> for (j in 1:length(idx)) {
>
> if (Employment.time$V1[i,j] == "Over 4 years") {
The problem in coding (aside from the conceptual misunderstandings identified
by Bert) are that there simply cannot be an [i,j] index to a column vector.
Perhaps you will loose the error with
Employment.time$V1[j] == "Over 4 years"
... but there are surely more compact ways of expressing this in R, if you
would only provide a better description of the data and what you are trying to
do.
--
David.
> dummy[i,j] <- 0
> }
> else {
> dummy[i,j] <- 1
> }
> }
> }
>
> but the R shows that
>
> Error in `[.default`(Employment.time$V1, i, j) :
> incorrect number of dimensions
That vector doesn't actually have dimensions (at least in R's meaning for the
word). Hence the error.
>
> Do you know where is wrong? many thanks!
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius
Alameda, CA, USA
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and provide commented, minimal, self-contained, reproducible code.
