[R] print only a few lines of an object

[Naresh Gurbuxani]

In an R session, when I type the name of an object, R prints the entire object (for example, a 20000 x 5 data.frame).  Is it possible to change the default behavior so that only the first five and last five rows are printed?  

Similarly, if the object is a 20000 x 200 matrix, the default behavior will be to print first five and last five columns, combined with first five and last five rows.  

Thanks,
Naresh