[R] Data frame: how to create list of row max?

[Prof Brian Ripley]

do.call("pmax", dataframe[,intensityindeces])

if I understand you aright.

On Mon, 19 Feb 2007, Johannes Graumann wrote:

> Dear all,
>
> Can anyone please shed some light onto how to do this?
>
> This will give me all "intensity" columsn in my data frame:
> intensityindeces <- grep("^Intensity",names(dataframe),value=TRUE)
>
> This will give me the maximum intensity for the first row:
> intensityone <- max(dataframe[1,intensityindeces])
>
> What I'm now looking for is how to dfo this for the whole data frame. Should
> yield a list of maximum intensities of all rows.
> Can't figure it out ... please nudge me where I need to go.


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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