When using downloaded R packages, such as "tm", the given example usually loads an example data set such as
data("crude")
How can I know what exactly this data set is, and in which kind of format, a matrix or a vector? Only by knowing this kind of information can I customize my input into the format required by this package.
Answer
try ?crude, str(crude) and summary(crude).
?crude will even get you some literature references.