Matrix: Bai/bfwa782

Description: BOUNDED FINLINE WAVEGUIDE EIGENMODES B SHULTZ AND S GEDNEY

Bai/bfwa782 graph Bai/bfwa782 graph
(bipartite graph drawing) (graph drawing of A+A')


Bai/bfwa782 dmperm of Bai/bfwa782

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  • download as a MATLAB mat-file, file size: 18 KB. Use UFget(294) or UFget('Bai/bfwa782') in MATLAB.
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    Matrix properties
    number of rows782
    number of columns782
    nonzeros7,514
    structural full rank?yes
    structural rank782
    # of blocks from dmperm2
    # strongly connected comp.2
    explicit zero entries0
    nonzero pattern symmetry 99%
    numeric value symmetry 96%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorB. Schultz, S. Gedney
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    date1994
    kindelectromagnetics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD10,824
    Cholesky flop count1.9e+05
    nnz(L+U), no partial pivoting, with AMD20,866
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD12,794
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD30,479

    SVD-based statistics:
    norm(A)12.5745
    min(svd(A))0.00722416
    cond(A)1740.61
    rank(A)782
    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/bfwa782 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.