[R] Counting similar rows

[Metronome123]

Startsituation: 

structure(c(1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 
0, 1, 1), .Dim = 4:5, .Dimnames = structure(list(subject = c("s1", 
"s2", "s3", "s4"), class = c("c1", "c2", "c3", "c4", "c5")), .Names =
c("subject", 
"class")), class = c("xtabs", "table"), call = xtabs(formula = ~subject + 
    class, data = ia))

I want a count of subjects that match the same classes in subject_cnt and a
count of the number of classes in class_cnt The result of this example
should be:

structure(list(subject_cnt = c(2L, 1L, 1L), class_cnt = c(3L, 
2L, 3L), c1 = c(1L, 1L, 0L), c2 = c(0L, 1L, 0L), c3 = c(1L, 0L, 
1L), c4 = c(0L, 0L, 1L), c5 = c(1L, 0L, 1L)), .Names = c("subject_cnt", 
"class_cnt", "c1", "c2", "c3", "c4", "c5"), class = "data.frame", row.names
= c(NA, 
-3L))

How can I achieve this in R, without complicated loops? 

PS. Note that the number of classes and subjects are in real quite big.

Cheers,


Lars



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