Singular Value Decomposition for Ruby with no dependency on GSL or LAPACK. Uses a C extension to the Numerical Recipies C implementation of an SVD matrix decomposer. Also includes an extension to the native Ruby Matrix class with a simple LSA method (decomposes the matrix, transposes matrix V, diagonalises the S array into a matrix, then removes all but the two leading terms in S to compress the original matrix to two dimensions).