[R] sorting matrix output alphabetically

[Prof Brian Ripley]

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)
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