The tolerance must be a real numeric scalar in the range sqrt(eps(class(A))) <= tolerance < 1. The block size must be a positive integer. Maximum number of iterations must be a positive integer. Maximum subspace dimension must be a positive integer. Number of power iterations must be a nonnegative integer, but is typically 0, 1, or 2. First input must be a matrix of type single or double. Incorrect number of input arguments. Each parameter name must be followed by a corresponding value.