[R] sorting matrix output alphabetically
Prof Brian Ripley
ripley at stats.ox.ac.uk
Sat Oct 18 12:40:04 CEST 2008
Do you mean sort by the *names* of a *vector* alphabetically? (tot is a
vector)? In which case tot[sort.list(names(tot))]
If you want to sort new.matrix by its *colnames* of new.matrix,
new.matrix[, sort.list(colnames(new.matrix))]
See 'An Introduction to R' for the ideas involved, and the help pages of
sort() and order().
On Sat, 18 Oct 2008, Bob Green wrote:
>
> Hello,
>
> I have been using the TM package to create a TermDocMatrix, which I have
> saved as a matrix so that I can view word frequencies. Below is a section of
> the code that I have used and an excerpt of the output: What I wanted to be
> able to do is to view the output alphabetically - rather than the results
> being sorted by frequency as below, that an alphabetical list would be
> generated. This would be quite long as the matrix is 176 x 2796, so I was
> hoping I could save the output in a csv file, which could be manipulated
> either in R or EXCEL.
>
> Any advice as to how I could do this is appreciated,
>
> Bob
>
> rec.matrix <- TermDocMatrix(recdata)
> recdata.matrix <- findFreqTerms(rec.matrix, 5, Inf)
>
> # creates a matrix
> new.matrix <- as(Data(rec.matrix), "matrix")
> tot <- colSums(new.matrix)
> sort(tot)
>
>
> unavail unwilling wheels
> 1 1 1
> evans interviewed jill
> 1 1 1
> referral achieved aids
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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