Bai/qc324 graph

Matrix: Bai/qc324

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

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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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    Bai/qc324

    Matrix properties
    number of rows324
    number of columns324
    nonzeros26,730
    structural full rank?yes
    structural rank324
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    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:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))23,247 26,528
    Cholesky flop count1.8e+06 2.4e+06
    nnz(L+U), no partial pivoting46,170 52,732
    nnz(V) for QR, upper bound nnz(L) for LU28,867 34,477
    nnz(R) for QR, upper bound nnz(U) for LU40,389 42,091

    Maintained by Tim Davis, last updated 30-Sep-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.