[R] formatting do.call output

[emorway]

Hello, 

With a dataset that is about 1.4e6 rows long
my.dat[seq(1:20),]
         date Cell_ID Classification WT_Depth Frac_ET_Satsfd
 1999-04-08     974              3 3.585083    0.244561400
 1999-04-08    1188              3 3.526001    0.123484700
 1999-04-08    1189              3 3.187012    0.215916700
 1999-04-08    1403              3 3.395020    0.163972900
 1999-04-08    1409              3 2.368042    0.415165500
 1999-04-08    1617              3 4.039917    0.003224544
 1999-04-08    1618              3 3.457886    0.148585900
 1999-04-08    1619              3 2.148926    0.475924300
 1999-04-08    1620              2 1.523926    0.633190900
 1999-04-08    1621              3 2.197998    0.469294300
 1999-04-15    1622              7 2.759033    0.325698400
 1999-04-15    1623              3 2.802002    0.313719600
 1999-04-15    1624              3 3.062988    0.243275900
 1999-04-15    1833              2 3.483032    0.141840700
 1999-04-15    1834              2 3.128052    0.232235400
 1999-04-15    1835              7 3.354004    0.176209000
 1999-04-15    1836              3 2.691040    0.341234700
 1999-04-15    1837              3 3.140991    0.228083800
 1999-04-15    1838              3 2.392944    0.413379300
 1999-04-15    2048              2 3.712036    0.084534560
.
.
.
I use
edm.func<-function(x){c(mu=mean(x),var=var(x))}
output<-do.call("rbind",tapply(my.dat$Frac_ET_Satsfd,list(my.dat$date,my.dat$Classification),edm.func))
data.frame(output)
            mu        var
1      0.7980007 0.03446669
2      0.7947966 0.03429280
3      0.8240736 0.02482441
.
.
3573 0.4509044 0.03821251
3574 0.4484108 0.03856110
3575 0.4519150 0.03889944

There are 447 dates and 8 classifications (1-8).  What is the best way to
include the corresponding date and classification that goes with each row?

Thanks Eric
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