A linear algebra library cooperating with NArray. This library calls blas and lapack routines for fast computations. This library has following functionalities. * xGEMM (multiply two matrices and add other matrix) * Solve LLS(Least Square Sum) problems * Computing determinant (using QR decomposition) * Solve eigenproblems (compute eigenvalues and eigenvectors) * (Pivoted) LU decompotision * SVD(Singular value decomposition) * QR decomposition * Cholesky decomposition