def iddp_rsvd(eps, m, n, matvect, matvec): """ Compute SVD of a real matrix to a specified relative precision using random matrix-vector multiplication. :param eps: Relative precision. :type eps: float :param m: Matrix row dimension. :type m: int :param n: Matrix column dimension. :type n: int :param matvect: Function to apply the matrix transpose to a vector, with call signature `y = matvect(x)`, where `x` and `y` are the input and output vectors, respectively. :type matvect: function :param matvec: Function to apply the matrix to a vector, with call signature `y = matvec(x)`, where `x` and `y` are the input and output vectors, respectively. :type matvec: function :return: Left singular vectors. :rtype: :class:`numpy.ndarray` :return: Right singular vectors. :rtype: :class:`numpy.ndarray` :return: Singular values. :rtype: :class:`numpy.ndarray` """ k, iU, iV, iS, w, ier = _id.iddp_rsvd(eps, m, n, matvect, matvec) if ier: raise _RETCODE_ERROR U = w[iU-1:iU+m*k-1].reshape((m, k), order='F') V = w[iV-1:iV+n*k-1].reshape((n, k), order='F') S = w[iS-1:iS+k-1] return U, V, S