R cheat sheet

source('file.R')	Load R file
dates = as.Date(as.character(L), "%m/%d/%Y")	Convert vector of ASCII dates into real ones
str(obj)	Show structure of an object
is.na(x)	find N/As in data
apply(my_matrix, 1, function(i) { commands; })	Anonymous functions
a <<- b;	Force a as a global variable inside the function
missing(param)	Check whether param wasn't specified when calling a function
stop	Stop function execution
warning	Print a warning
options(echo = FALSE);	Suppress echoing of commands inside a script

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