Return cartesian coordinate from a fractional one.

def cartisian_from_fractional(coordinate, lattice_array):
    """Return cartesian coordinate from a fractional one."""
    orthogonalisation_M = np.matrix(lattice_array)
    orthogonal = orthogonalisation_M * coordinate.reshape(-1, 1)
    return np.array(orthogonal.reshape(1, -1))