[R] String frequencies in rows

[Mario Falchi]

Hi All,
 
I’m trying to evaluate the frequency of different strings in each row of a 
data.frame :
INPUT:
ID G1 G2 G3 G4 … GN
1 AA BB AB AB … 
2 BB AB AB AA … 
3 AC CC AC AA … 
4  BB BB BB BB… 

The number of different strings can vary in each row.
 
My solution has been:
for (i in 1:length(INPUT[,1])){
 b=as.data.frame(table(t((INPUT[i,2:5]))))
<some operations using the string values and frequencies>
(e.g. b for i==1 is:
 AA 1
 BB 1
 AB 2 )
} 

However my dataframe contains thousands rows and this script takes a lot of 
time.
Could someone suggest me a faster way?
 
Thank you very much,
Mario Falchi
        [[alternative HTML version deleted]]


______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.