pub type igraph_arpack_error_t = c_uint;Expand description
\typedef igraph_arpack_error_t \brief Error codes from ARPACK.
These error codes represent error conditions returned from ARPACK. They are used internally to format error messages when igraph itself returns an \c IGRAPH_EARPACK error code from an ARPACK-related function.
\enumval IGRAPH_ARPACK_NO_ERROR No error was encountered in ARPACK. \enumval IGRAPH_ARPACK_PROD Matrix-vector product failed (not used any more). \enumval IGRAPH_ARPACK_NPOS N must be positive. \enumval IGRAPH_ARPACK_NEVNPOS NEV must be positive. \enumval IGRAPH_ARPACK_NCVSMALL NCV must be bigger. \enumval IGRAPH_ARPACK_NONPOSI Maximum number of iterations should be positive. \enumval IGRAPH_ARPACK_WHICHINV Invalid WHICH parameter. \enumval IGRAPH_ARPACK_BMATINV Invalid BMAT parameter. \enumval IGRAPH_ARPACK_WORKLSMALL WORKL is too small. \enumval IGRAPH_ARPACK_TRIDERR LAPACK error in tridiagonal eigenvalue calculation. \enumval IGRAPH_ARPACK_ZEROSTART Starting vector is zero. \enumval IGRAPH_ARPACK_MODEINV MODE is invalid. \enumval IGRAPH_ARPACK_MODEBMAT MODE and BMAT are not compatible. \enumval IGRAPH_ARPACK_ISHIFT ISHIFT must be 0 or 1. \enumval IGRAPH_ARPACK_NEVBE NEV and WHICH=‘BE’ are incompatible. \enumval IGRAPH_ARPACK_NOFACT Could not build an Arnoldi factorization. \enumval IGRAPH_ARPACK_FAILED No eigenvalues to sufficient accuracy. \enumval IGRAPH_ARPACK_HOWMNY HOWMNY is invalid. \enumval IGRAPH_ARPACK_HOWMNYS HOWMNY=‘S’ is not implemented. \enumval IGRAPH_ARPACK_EVDIFF Different number of converged Ritz values. \enumval IGRAPH_ARPACK_SHUR Error from calculation of a real Schur form. \enumval IGRAPH_ARPACK_LAPACK LAPACK (dtrevc) error for calculating eigenvectors. \enumval IGRAPH_ARPACK_UNKNOWN Unknown ARPACK error.