**More on sequences**

A
*sequence*
is simply an ordered collection of numbers or other Maple expressions separated by commas.

Here is an example of a sequence in Maple. Remember, a sequence can contain any mixture of numbers and other Maple expressions.

`> `
**myseq := 1, 5, x, z^2, 3;**

You can pick out any member of a sequence by specifying its position in the sequence. For example, to refer to the third member in
*myseq*
:

`> `
**myseq[3];**

__Generating Sequences__

There are several ways to generate sequences in Maple. The first is the method we used above: type in the sequence. This can be inconvenient when we need to generate large sequences, however. When the sequence has a simple pattern, Maple provides some more efficient methods for generating sequences. One such method is the
*seq*
command:

`> `
**seq( i, i = 6..9 );
squares := seq( i^2, i = 2..5 );**

`> `

Get the idea? In general, the first expression (
*i^2*
in the second example) is repeated in a sequence, with
*i *
changing as specified (from 2 to 5 in the second example). You can use letters other than
*i *
if you like.