Extracts rows of a data frame and, if there is one row only, coerces to a count object, preserving the species names
extractor(x, index)
A data frame with column headings being species names
A vector of indices to extract
If index is length one, the numbers are interpreted as species counts, and the output is coereced to a count object.
index
count
# NOT RUN { data(saunders) plot(extractor(saunders.exposed,1)) # }
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