Matrix: Bai/qc324

Description: MODEL H2+ IN AN ELECTROMAGNETIC FIELD, S.I. CHU

Bai/qc324 graph
(undirected graph drawing)

Bai/qc324

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  • Matrix group: Bai
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  • download as a MATLAB mat-file, file size: 50 KB. Use UFget(327) or UFget('Bai/qc324') in MATLAB.
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    Matrix properties
    number of rows324
    number of columns324
    nonzeros26,730
    structural full rank?yes
    structural rank324
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 0%
    typecomplex
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorS. Chu
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    date1991
    kindelectromagnetics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD23,247
    Cholesky flop count1.8e+06
    nnz(L+U), no partial pivoting, with AMD46,170
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD28,867
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD40,389

    SVD-based statistics:
    norm(A)1.52311
    min(svd(A))3.2877e-05
    cond(A)46327.5
    rank(A)324
    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

    Bai/qc324 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.