Matrix: HB/jagmesh9

Description: SYMMETRIC PATTERN FROM ALAN GEORGE - PINCHED HOLE PROBLEM

HB/jagmesh9 graph
(undirected graph drawing)


HB/jagmesh9

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  • Matrix group: HB
  • Click here for a description of the HB group.
  • Click here for a list of all matrices
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  • download as a MATLAB mat-file, file size: 12 KB. Use UFget(184) or UFget('HB/jagmesh9') in MATLAB.
  • download in Matrix Market format, file size: 11 KB.
  • download in Rutherford/Boeing format, file size: 11 KB.

    Matrix properties
    number of rows1,349
    number of columns1,349
    nonzeros9,101
    structural full rank?yes
    structural rank1,349
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorA. George
    editorI. Duff, R. Grimes, J. Lewis
    date1978
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD21,425
    Cholesky flop count4.6e+05
    nnz(L+U), no partial pivoting, with AMD41,501
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD31,083
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD57,431

    SVD-based statistics:
    norm(A)6.95429
    min(svd(A))0.00115203
    cond(A)6036.54
    rank(A)1,349
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

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

    HB/jagmesh9 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.