So you've read your data into an R object. Now what?
Examine your data object
Before you start analyzing, you might want to take a look at your data object's structure and a few row entries. If it's a 2-dimensional table of data stored in an R data frame object with rows and columns -- one of the more common structures you're likely to encounter -- here are some ideas. Many of these also work on 1-dimensional vectors as well.
Many of the commands below assume that your data are stored in a variable called mydata (and not that mydata is somehow part of these functions' names).
[This story is part of Computerworld's "Beginner's guide to R." To read from the beginning, check out the introduction; there are links on that page to the other pieces in the series.]