Matrix: Alemdar/Alemdar

Description: Finite-element matrix from Bulent Alemdar, RAM International.

Alemdar/Alemdar graph
(undirected graph drawing)

Alemdar/Alemdar dmperm of Alemdar/Alemdar

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  • Matrix group: Alemdar
  • Click here for a description of the Alemdar group.
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  • download as a MATLAB mat-file, file size: 109 KB. Use UFget(923) or UFget('Alemdar/Alemdar') in MATLAB.
  • download in Matrix Market format, file size: 95 KB.
  • download in Rutherford/Boeing format, file size: 69 KB.

    Matrix properties
    number of rows6,245
    number of columns6,245
    structural full rank?yes
    structural rank6,245
    # of blocks from dmperm6
    # strongly connected comp.6
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?no

    authorB. Alemdar
    editorT. Davis
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD149,205
    Cholesky flop count1.0e+07
    nnz(L+U), no partial pivoting, with AMD292,165
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD267,458
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD511,852

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

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

    Alemdar/Alemdar 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.