I have got a dataframe containing measurement of aircraft noise like
this:
 
> Id <- c(1,4,5,2,3,6,4,1,2,5,6,3) 
> Noise <- c(88,94,97,98,92,56,103,102,87,95,92,97) 
> Height <- c(190, 150, 120, 115, 188, 104, 101, 189, 146, 111, 124,
126) 
>  
> df <- data.frame(Id, Noise, Height) 
Now I would like to split this in two new dataframes. The first one
containing the rows with the maximum Noise for each Id and in the second
the other rows.
 
I manage to find that maximum Noise levels...
 
> m <- tapply(df$Noise, Id.factor, max) 
> m 
   1   2   3   4   5   6  
102  98  97 103  97  92
 
But how do I split my dataframe?
 
 
-- 
    Ed Gordijn
    Adviseur geluidscapaciteit

    Amsterdam Airport Schiphol
    Business Area Aviation (A/CAP/EC)
    Postbus 7501,  1118 ZG  Schiphol 
    Bezoekadres: Evert v/d Beekstraat 202, 1118 CP  Schiphol

    tel       020 601 32 22
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    e-mail  gordijn_e@schiphol.nl 

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