Lisp-Matrix is a reasonably modern, flexible system for numeric algebra in Lisp. At the lowest level, LAPACK performs the heavy numerical computation through a foreign function interface (CFFI). There is also a suite of lisp routines that provide the sort of simple matrix manipulation used frequently in MATLAB.
Please use the github repository to download and install manually:
git clone git://github.com/blindglobe/lisp-matrix.git
Note that you will also need the following dependencies: