[R] Odp: by funtion

[Petr PIKAL]

Hi


r-help-bounces at r-project.org napsal dne 29.04.2010 05:56:23:

> Hello,
> 
> I have a data.frame:
> name    col1    col2    col3    col4
> AA    23    54    0.999    0.78
> BB    123    5    1    0.99
> AA    203    98    0.79    0.99
> 
> I want to get mean value data.frame in terms of name:
> 
> name    col1    col2    col3    col4
> 
> AA    113.0000  76.0000   0.8945   0.8850
> 
> BB    123.00   5.00   1.00   0.99
> 
> I tried to use by function:
> 
> >aa<-by(test[,2:5], feature, mean)
> I found aa is "by" function. 
> > class(aa)
> [1] "by"
> 
> how can I transfer aa to a data frame?

use aggregate instead

aa<-aggregate(test[,2:5], feature, mean)

Regards
Petr

> 
> thanks
> YU
> 
> 
> 
> 
> 
> 
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