Matrix: DNVS/thread

Description: DNV-Ex 7 : Threaded connector/contact problem-1999-01-17

DNVS/thread graph
(undirected graph drawing)


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  • Matrix group: DNVS
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  • download as a MATLAB mat-file, file size: 32 MB. Use UFget(1283) or UFget('DNVS/thread') in MATLAB.
  • download in Matrix Market format, file size: 25 MB.
  • download in Rutherford/Boeing format, file size: 21 MB.

    Matrix properties
    number of rows29,736
    number of columns29,736
    structural full rank?yes
    structural rank29,736
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries25,168
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorC. Damhaug
    editorJ. Koster
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD28,383,936
    Cholesky flop count5.0e+10
    nnz(L+U), no partial pivoting, with AMD56,738,136
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD71,556,047
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD146,878,900

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 25168 explicit zero entries.

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

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

    DNVS/thread 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.