[R] Matrix Another table

[RMSOPS]

I have next table 
source destine 
3 3 
7 7 
6 6 
3 4
 4 4
 4 3 
3 3 
3 3
 3 3
 3 3 
3 4
 4 4
 4 3
 3 4
 4 3

 I'm trying to create an array with the number of occurrences between the
source and destination. id_ap<-levels(factor(df$v_source))
num_AP<-length(levels(factor(df$v_source)))
mat<-matrix(data=NA,nrow=num_AP,ncol=num_AP,
byrow=TRUE,dimnames=list(id_ap,id_ap)) 
1 2 3 4 5 6 7 
1 NA NA NA NA NA NA NA 
2 NA NA NA NA NA NA NA 
3 NA NA NA 4 NA NA NA 4 
NA NA NA NA NA NA NA 5 
NA NA NA NA NA NA NA 6 
NA NA NA NA NA NA NA 7 
NA NA NA NA NA NA NA 

what better way to count the occurrences of the table, for example 3-4 = 4
times

 Thanks 



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