Matrix: Wang/swang2

Description: Discret.vorticity eqn, square driven cavity, semiconductor device sim.

Wang/swang2 graph
(undirected graph drawing)


Wang/swang2

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  • Matrix group: Wang
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  • download as a MATLAB mat-file, file size: 189 KB. Use UFget(829) or UFget('Wang/swang2') in MATLAB.
  • download in Matrix Market format, file size: 150 KB.
  • download in Rutherford/Boeing format, file size: 131 KB.

    Matrix properties
    number of rows3,169
    number of columns3,169
    nonzeros20,841
    structural full rank?yes
    structural rank3,169
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorS. Wang
    editorT. Davis
    date1994
    kindsubsequent semiconductor device problem
    2D/3D problem?yes

    Notes:

    next: - first: Wang/swang1
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD60,493
    Cholesky flop count2.0e+06
    nnz(L+U), no partial pivoting, with AMD117,817
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD87,927
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD163,509

    SVD-based statistics:
    norm(A)0.0364463
    min(svd(A))0.00329178
    cond(A)11.0719
    rank(A)3,169
    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

    Wang/swang2 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.