Matrix: HB/young2c

Description: complex matrix from aero research, David Young, corrected CUA version

HB/young2c graph
(undirected graph drawing)

HB/young2c

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 8 KB. Use UFget(279) or UFget('HB/young2c') in MATLAB.
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    Matrix properties
    number of rows841
    number of columns841
    nonzeros4,089
    structural full rank?yes
    structural rank841
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 85%
    typecomplex
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorD. Young
    editorI. Duff, R. Grimes, J. Lewis
    date1984
    kindduplicate acoustics problem
    2D/3D problem?yes

    Notes:

    duplicate of HB/young1c

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD9,198
    Cholesky flop count1.6e+05
    nnz(L+U), no partial pivoting, with AMD17,555
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD15,517
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD27,859

    SVD-based statistics:
    norm(A)470.196
    min(svd(A))1.13296
    cond(A)415.015
    rank(A)841
    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/young2c 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.