Matrix: Bai/pde225

Description: MODEL PDE PROBLEM, H. ELMAN NX = NY = 15

Bai/pde225 graph
(undirected graph drawing)


Bai/pde225

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  • Matrix group: Bai
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  • download as a MATLAB mat-file, file size: 9 KB. Use UFget(323) or UFget('Bai/pde225') in MATLAB.
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    Matrix properties
    number of rows225
    number of columns225
    nonzeros1,065
    structural full rank?yes
    structural rank225
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 50%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorH. Elman
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    date1982
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,798
    Cholesky flop count1.9e+04
    nnz(L+U), no partial pivoting, with AMD3,371
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD2,482
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD4,399

    SVD-based statistics:
    norm(A)9.78862
    min(svd(A))0.25058
    cond(A)39.0638
    rank(A)225
    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/pde225 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.