BLAS Level 2 TRSV (triangular solve) for ndarrays
npm install ndarray-blas-trsv 
BLAS Level 2 TRSV (triangular solve) for ndarrays
##### trsv( A, x [, uplo] )
Calculate x <- A^-1 x for the upper triangular matrix A using back-substitution. Data below the diagonal is ignored. If uplo is 'lo', uses the lower triangular portion of A and performs forward-substitution instead. Result overwrites the vector x.