The clarification helps; the original description was rather terse.
What about:
> row <- c("a","b","c","d","e","f","g") #rows from larger data frame
>
> x <- data.frame(sp1=rnorm(4), sp2=rnorm(4), sp3=rnorm(4), sp4=rnorm(4))
>
> rownames(x) <- row.1
>
> merge(x, matrix(row, ncol=1), by.x=0, by.y=1, all=TRUE)
Row.names sp1 sp2 sp3 sp4
1 a 0.4964272 1.4989159 0.4302415 0.9648854
2 b 1.4137142 0.9430609 0.0728391 -0.6275084
3 c -0.8103023 -1.3375148 -0.3799518 0.4523287
4 d NA NA NA NA
5 e NA NA NA NA
6 f NA NA NA NA
7 g -0.1914184 0.5156566 0.5626614 0.8068154
Sarah
On Wed, Apr 25, 2012 at 10:42 AM, Stephen Sefick <sas0...@auburn.edu> wrote:
> I am subsetting a larger data frame that contains macroinverterate taxa. I
> am subsetting them at different levels of taxonomic resolution. Some of the
> sites do not have say Tipulidae present, so the rows are removed completely
> for this site. I would like to fill in the sites that were removed during
> the subsetting and fill these with 0. I have the non-subsetted dataframe
> which contains all of the sites. I would like to use the sites from this
> complete data set to "expand" the dataframe that is a subset of the sites in
> the original. Is that more clear.
>
> Stephen
>
--
Sarah Goslee
http://www.functionaldiversity.org
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