[R] rev matrix
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Oct 15 08:42:05 CEST 2004
On Thu, 14 Oct 2004 lindsayv at unbc.ca wrote:
> I am looking for a function which performs the same thing as rev but on a
> matrix rather then a vector, based on one column.
> I'd be happy to read the man page if such a function exists.
If I understand you, it is easy to do by indexing, but `based on >one<
column' puzzles me and I take it you want each column reversed.
A <- matrix(1:20, 4, 5)
or more generally
If that is not what you mean, please give us an example to look at.
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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