rmatrix

https://github.com/wouterken/RMatrix

RMatrix is a lightning fast library for Ruby. It provides numerous enhancements over the Matrix class in the standard library. Features include the ability to calculate Matrix inverse, transpose, determinant, minor, adjoint, cofactor_matrix, hadamard product and other elementwise operations, slicing, masking and more. RMatrix makes use of backing instances of NArray to allow for great performance.