On 06/07/2012 08:08 AM, Faz Jones wrote:
Hi,
I have attached a word document to explain the problem i am having
creating a for-loop in R with conditions to create a frequency table.
I am new to R so any help would be greatly appreciated.
Hi Jones,
Unfortunately, you might as well have attached a popsicle to a camel and
sent it across the Sahara. Just to show you that this help list really
is helpful, I'm going to try to read your mind. You want to create a
frequency table by counting the values in some set of observations.
Maybe it's homework. Heck, anybody who tries to send a Word document to
the R help list is more to be pitied than censured.
# get a bunch of observations
mydata<-sample(LETTERS[1:6],50,TRUE)
# let's pretend that we don't know how many different letters there are
allletters<-sort(unique(mydata))
# now create something to hold your answer
myanswer<-rep(0,length(allletters))
# give it some names, you'll need them later
names(myanswer)<-allletters
# okay, here we go round the loop
for(i in 1:length(mydata)) {
answerindex<-which(allletters %in% mydata[i])
myanswer[answerindex]<-myanswer[answerindex]+1
}
print(myanswer)
table(mydata)
Feel better now?
Jim
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