[R] using the function unique(), but asking it to ignore a column of a data.frame
h.wickham at gmail.com
Mon Jul 9 15:28:23 CEST 2007
On 7/9/07, Andrew Yee <yee at post.harvard.edu> wrote:
> Take for example the following data.frame:
> I'd like to be able to use unique(sample.data.frame), but have
> unique() ignore column a when determining the unique elements.
> However, I figured that this would be setting for incomparables=, but
> it appears that this funcationality hasn't been incorporated. Is
> there a work around for this, i.e. to be able to get unique to only
> look at selected columns of a data frame?
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