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?

thanks
YU





      
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