[R] Simple 'frequency' function?
Dan Bolser
dmb at mrc-dunn.cam.ac.uk
Fri Jul 9 14:22:13 CEST 2004
Hi, I have designed the following function to extract count frequencies
from an array of integers. For example...
# Tipical array
x <- cbind(1,1,1,1,1,2,2,2,2,3,3,3,3,4,5,6,7,22)
# Define the frequency function
frequency <-
function(x){
max <- max(x)
j <- c()
for(i in 1:max){
j[i] <- length(x[x==i])
}
return(j)
}
fre <- frequency(x)
plot(fre)
How can I ...
1) Make this a general function so my array could be of the form
# eats!
x <- cbind( "egg","egg","egg","egg","ham","ham","ham","ham","chicken" )
fre <- frequency(x)
plot(fre)
2) Make frequency return an object which I can call plot on (allowing the
prob=TRUE option).
Cheers,
Dan.
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