Matrix: HB/can_187

Description: SYMMETRIC PATTERN FROM CANNES,LUCIEN MARRO,JUNE 1981.

HB/can_187 graph
(undirected graph drawing)


HB/can_187

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 2 KB. Use UFget(95) or UFget('HB/can_187') in MATLAB.
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    Matrix properties
    number of rows187
    number of columns187
    nonzeros1,491
    structural full rank?yes
    structural rank187
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorL. Marro
    editorI. Duff, R. Grimes, J. Lewis
    date1981
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,180
    Cholesky flop count3.0e+04
    nnz(L+U), no partial pivoting, with AMD4,173
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,821
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD6,465

    SVD-based statistics:
    norm(A)8.39982
    min(svd(A))1.16724e-16
    cond(A)7.19632e+16
    rank(A)184
    sprank(A)-rank(A)3
    null space dimension3
    full numerical rank?no
    singular value gap1.66647e+13

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    HB/can_187 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.