Had to look this one up, so here it is:
length(unique(x))
Counts the number of distinct items in a vector in R.
r
17
Mar 10
R: “while” loops
R has regular while loops:
while (condition) {
Note that if you try to get help about while you get an error:
help(while)
Error: unexpected ‘)’ in “help(while)”
16
Mar 10
R tip iterating over list
To iterate over a list by key, value pair, do this:
for (name in names(myList)) {
print(name)
print(myList[[name]])
}
Note the double [[]] so you get just the value, not the pair.