Hi,
I am trying to get a summary of the counts of different variables for each sample in a matrix of the form "m" below to generate an output as shown. (Ultimately I want to generate a stacked barchart for each sample). I am only able to get the "table" function to work on one sample (column) at a time. Any help appreciated.
Thank you
Sarah
 
a<-c("A", "A", "B", "B", "C", "A", "C", "D", "A", "D", "C", "A", "D", "C", "A", "C")
m<-matrix(a, nrow=4)
m
     [,1] [,2] [,3] [,4]
[1,] "A"  "C"  "A"  "D" 
[2,] "A"  "A"  "D"  "C" 
[3,] "B"  "C"  "C"  "A" 
[4,] "B"  "D"  "A"  "C" 

output needed (so that I can use the "barplot(t(output))" function):
 A B C D
[,1] 2 2 0 0
[,2] 1 0 2 1
[,3] 2 0 1 1
[,4] 1 0 2 1
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