Matrix: Rothberg/struct3

Description: Finite element matrix, from Ed Rothberg, Silicon Graphics, Inc.

Rothberg/struct3 graph
(undirected graph drawing)

Rothberg/struct3 dmperm of Rothberg/struct3

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  • Matrix group: Rothberg
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  • download as a MATLAB mat-file, file size: 748 KB. Use UFget(807) or UFget('Rothberg/struct3') in MATLAB.
  • download in Matrix Market format, file size: 1 MB.
  • download in Rutherford/Boeing format, file size: 628 KB.

    Matrix properties
    number of rows53,570
    number of columns53,570
    nonzeros1,173,694
    structural full rank?yes
    structural rank53,570
    # of blocks from dmperm2
    # strongly connected comp.2
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorE. Rothberg
    editorT. Davis
    date1997
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD4,945,868
    Cholesky flop count1.0e+09
    nnz(L+U), no partial pivoting, with AMD9,838,166
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD9,586,863
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD18,314,276

    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.