Matrix: ANSYS/Delor338K

Description: underdetermined system from ANSYS

ANSYS/Delor338K graph
(bipartite graph drawing)

scc of ANSYS/Delor338K

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  • Matrix group: ANSYS
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  • download as a MATLAB mat-file, file size: 28 MB. Use UFget(2653) or UFget('ANSYS/Delor338K') in MATLAB.
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    Matrix properties
    number of rows343,236
    number of columns887,058
    structural full rank?yes
    structural rank343,236
    # of blocks from dmperm1
    # strongly connected comp.437,423
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorE. Delor
    editorT. Davis
    kindleast squares problem
    2D/3D problem?no


    Goal is to find a permutation or factorization        
    that places A in upper trapezoidal form, [R1 R2] where
    R1 is well-conditioned, square, and upper triangular, 
    and where R1\R2 is as sparse as possible.             

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD116,855,252
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD53,456,930

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 04-Jun-2015.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.