I execute the following code:
df<-data.frame(word=c("play","win","offer","http"),frequency=c(321,355,123,564),type=c("nonspam","nonspam","spam","spam"))
df=arrange(df,desc(frequency),desc(type))
df=df[order(df[,2],df[,3]),]
and the result is:
   word frequency type
4 offer       123    spam
3  play       321    nonspam
2   win       355    nonspam
1  http       564    spam
but I want to sort the data frame with respect to frequency and type such as:
word frequency type
    1  http      564    spam
    4  offer     123    spam
    2  win       355    nonspam
    3  play      321    nonspam
 
    