The first thing most people like to do after reading in data is to take a look at the data. Or, find out about individual variables in the data frame. To look at the entire dataset, type "edit(<mydataobject>)", where <mydataobject> is replaced by the object name of the dataset that you read or created. It will show up the data matrix. You can also use the square brackets to index elements of the dataframes or vectors. Use dollar signs ($) to extract specific variables for data frames. If you have attached a particular data frame into the namespace, you can access the individual variables by simply typing their variable name, you will not have to use the dollar sign for accessing them anymore.