Matrix: Bai/odepb400

Description: MODEL ORDINARY DIFFERENTIAL EIGENVALUE PROBLEM

Bai/odepb400 graph
(undirected graph drawing)


Bai/odepb400 dmperm of Bai/odepb400
scc of Bai/odepb400

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  • download as a MATLAB mat-file, file size: 2 KB. Use UFget(317) or UFget('Bai/odepb400') in MATLAB.
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    Matrix properties
    number of rows400
    number of columns400
    nonzeros399
    structural full rank?no
    structural rank399
    # of blocks from dmperm401
    # strongly connected comp.400
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorG. Stewart
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    date1978
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD400
    Cholesky flop count4.0e+02
    nnz(L+U), no partial pivoting, with AMD400
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD400
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD400

    SVD-based statistics:
    norm(A)2.66e-14
    min(svd(A))0
    cond(A)Inf
    rank(A)399
    sprank(A)-rank(A)0
    null space dimension1
    full numerical rank?no
    singular value gapInf

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    Bai/odepb400 svd

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.