Rlab is not a clone of MATLAB. It bases itself on matrix maths, and the concepts and the operators are very similar but Rlab uses a totally different syntax that make it more powerful and efficient, and reduces the ambiguities between both applications.
It is important to take into account that this program is handled by means of the command line console. So it isn't apt for “windows” addicts. If you are used to this work method, you will soon realize this programs power.
Even though its development finished in 2001, Rlab still has versions for Windows and Linux, and we will be able to obtain the source code under the GPL license, so if you want to develop scientific applications download this software.