Matlab and Octave are the names for a high-level computational package primarily intended for solving problems in linear algebra, and are mostly compatible with each other. While Matlab is only commercially available, Octave is free under the terms of the Free Software Foundation's GNU General Public License.

When Matlab/Octave is invoked, the prompt will appear on the screen

>Then type at the prompt

> A = [1 -2 1; 0 2 -8; -4 5 9]where the semicolons (

> A = [1 -2 1 0 2 -8 -4 5 9]In either way the system will promptly produce the formatted output, and recognize it as the

A = 1 -2 1 0 2 -8 -4 5 9

To exit Matlab/Octave, type

> exit

Matlab/Octave is an interactive system:
For example, if ```x = 3.14`'' then
you can later find the value of ```x`'' interactively
by simply typing ```x`''.

**Installing Octave.**
GNU Octave is available for Windows and Linux (but not for Mac).
Sources and binaries can be found at
`http://www.octave.org/`.
Windows users may proceed the installation by simply
downloading and running

Or, go to

`http://sourceforge.net/projects/octave/`

and look for a new version of ```octave-X.X.XX-windows`.''

Department of Mathematics