[R] Functions on matrix row level

[Peter Dalgaard BSA]

"Arndt, Ulrich, VF-VP" <ulrich.arndt at vodafone.de> writes:

> Hi together,
> 
> I have some data in a matrix structure - say 1000 rows with 10 columns. And
> I like to do some calculations (like max, avg or min) on row level. 
> The only solution I found so fare was using a loop like 
> 
> for (i in 1:1000) {
>        max[i]  <- max(matrix[I,])
> }
> 
> It looks like that this is not very fast.
> Does an other way exists?

apply(matrix,1,max)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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