scipy.sparse.linalg.ArpackError¶

exception
scipy.sparse.linalg.
ArpackError
(info, infodict={'c': {0: 'Normal exit.', 1: 'Maximum number of iterations taken. All possible eigenvalues of OP has been found. IPARAM(5) returns the number of wanted converged Ritz values.', 2: 'No longer an informational error. Deprecated starting with release 2 of ARPACK.', 3: 'No shifts could be applied during a cycle of the Implicitly restarted Arnoldi iteration. One possibility is to increase the size of NCV relative to NEV. ', 9999: 'Could not build an Arnoldi factorization. IPARAM(5) returns the size of the current Arnoldi factorization. The user is advised to check that enough workspace and array storage has been allocated.', 13: "NEV and WHICH = 'BE' are incompatible.", 12: 'IPARAM(1) must be equal to 0 or 1.', 1: 'N must be positive.', 10: 'IPARAM(7) must be 1, 2, 3.', 9: 'Starting vector is zero.', 8: 'Error return from LAPACK eigenvalue calculation;', 7: 'Length of private work array WORKL is not sufficient.', 6: "BMAT must be one of 'I' or 'G'.", 5: " WHICH must be one of 'LM', 'SM', 'LR', 'SR', 'LI', 'SI'", 4: 'The maximum number of Arnoldi update iterations allowed must be greater than zero.', 3: 'NCVNEV >= 2 and less than or equal to N.', 2: 'NEV must be positive.', 11: "IPARAM(7) = 1 and BMAT = 'G' are incompatible."}, 's': {0: 'Normal exit.', 1: 'Maximum number of iterations taken. All possible eigenvalues of OP has been found. IPARAM(5) returns the number of wanted converged Ritz values.', 2: 'No longer an informational error. Deprecated starting with release 2 of ARPACK.', 3: 'No shifts could be applied during a cycle of the Implicitly restarted Arnoldi iteration. One possibility is to increase the size of NCV relative to NEV. ', 9999: 'Could not build an Arnoldi factorization. IPARAM(5) returns the size of the current Arnoldi factorization. The user is advised to check that enough workspace and array storage has been allocated.', 13: "NEV and WHICH = 'BE' are incompatible.", 12: 'IPARAM(1) must be equal to 0 or 1.', 2: 'NEV must be positive.', 10: 'IPARAM(7) must be 1, 2, 3, 4.', 9: 'Starting vector is zero.', 8: 'Error return from LAPACK eigenvalue calculation;', 7: 'Length of private work array WORKL is not sufficient.', 6: "BMAT must be one of 'I' or 'G'.", 5: " WHICH must be one of 'LM', 'SM', 'LR', 'SR', 'LI', 'SI'", 4: 'The maximum number of Arnoldi update iterations allowed must be greater than zero.', 3: 'NCVNEV >= 2 and less than or equal to N.', 1: 'N must be positive.', 11: "IPARAM(7) = 1 and BMAT = 'G' are incompatible."}, 'z': {0: 'Normal exit.', 1: 'Maximum number of iterations taken. All possible eigenvalues of OP has been found. IPARAM(5) returns the number of wanted converged Ritz values.', 2: 'No longer an informational error. Deprecated starting with release 2 of ARPACK.', 3: 'No shifts could be applied during a cycle of the Implicitly restarted Arnoldi iteration. One possibility is to increase the size of NCV relative to NEV. ', 9999: 'Could not build an Arnoldi factorization. IPARAM(5) returns the size of the current Arnoldi factorization. The user is advised to check that enough workspace and array storage has been allocated.', 13: "NEV and WHICH = 'BE' are incompatible.", 12: 'IPARAM(1) must be equal to 0 or 1.', 1: 'N must be positive.', 10: 'IPARAM(7) must be 1, 2, 3.', 9: 'Starting vector is zero.', 8: 'Error return from LAPACK eigenvalue calculation;', 7: 'Length of private work array WORKL is not sufficient.', 6: "BMAT must be one of 'I' or 'G'.", 5: " WHICH must be one of 'LM', 'SM', 'LR', 'SR', 'LI', 'SI'", 4: 'The maximum number of Arnoldi update iterations allowed must be greater than zero.', 3: 'NCVNEV >= 2 and less than or equal to N.', 2: 'NEV must be positive.', 11: "IPARAM(7) = 1 and BMAT = 'G' are incompatible."}, 'd': {0: 'Normal exit.', 1: 'Maximum number of iterations taken. All possible eigenvalues of OP has been found. IPARAM(5) returns the number of wanted converged Ritz values.', 2: 'No longer an informational error. Deprecated starting with release 2 of ARPACK.', 3: 'No shifts could be applied during a cycle of the Implicitly restarted Arnoldi iteration. One possibility is to increase the size of NCV relative to NEV. ', 9999: 'Could not build an Arnoldi factorization. IPARAM(5) returns the size of the current Arnoldi factorization. The user is advised to check that enough workspace and array storage has been allocated.', 13: "NEV and WHICH = 'BE' are incompatible.", 12: 'IPARAM(1) must be equal to 0 or 1.', 2: 'NEV must be positive.', 10: 'IPARAM(7) must be 1, 2, 3, 4.', 9: 'Starting vector is zero.', 8: 'Error return from LAPACK eigenvalue calculation;', 7: 'Length of private work array WORKL is not sufficient.', 6: "BMAT must be one of 'I' or 'G'.", 5: " WHICH must be one of 'LM', 'SM', 'LR', 'SR', 'LI', 'SI'", 4: 'The maximum number of Arnoldi update iterations allowed must be greater than zero.', 3: 'NCVNEV >= 2 and less than or equal to N.', 1: 'N must be positive.', 11: "IPARAM(7) = 1 and BMAT = 'G' are incompatible."}})[source]¶ ARPACK error