If you know the name of a function but you don't know how to
use it, try the help command - e.g. help sum tell you
how to sum the elements of an array. Throughout this document details
of commands will be omitted - using help or, better still, the
WWW documents will help you find all there is to know.
If you don't know the name of the function you need, look
through the lists in the first section, or use the lookfor command - e.g. lookfor sum will tell you the names of all the functions that
might have something to do with summing.
