[R] Sorting a data frame

[Prof Brian Ripley]

On Thu, 31 Jul 2003, BORGULYA Gábor wrote:

> I think this is an important example! Is there a way to make it included 
> in the help of order?

Please explain why it adds to what is already there, which looks very 
similar to me.

> Maybe a shortened version:
> 
> # sorting a data frame
> df <- data.frame(V1 = c("W","A", "A", "B", ""), V2 = c("E", "M", "B", 
> "O", "Q"))
> sorted <- df[order(df$V1, df$V2), ]
> 
> 
> And a question: what to do to have the sorted data frame with the row 
> labels 1:n?

Re-assign the row names?


> Gábor
> 
> ----------------------------------------------------------------
> Marc Schwartz írta:
> > On Wed, 2003-07-16 at 08:42, Wayne Jones wrote:
> >>Does anyone know if it is possible to sort a dataframe?
> 
> > Example:
> 
> # Create two column df
> df <- data.frame(V1 = c("W","A", "A", "B", ""), V2 = c("E", "M", "B", 
> "O", "Q"))
> # show df unsorted
> df
> 
>    V1 V2
> 1  W  E
> 2  A  M
> 3  A  B
> 4  B  O
> 5     Q
> 
> # now sort df, by V1, then V2
> df[order(df$V1, df$V2), ]
> 
>    V1 V2
> 5     Q
> 3  A  B
> 2  A  M
> 4  B  O
> 1  W  E
> 
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> 
> 

-- 
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