Matrix: ANSYS/Delor64K

Description: underdetermined system from ANSYS

ANSYS/Delor64K graph
(bipartite graph drawing)


ANSYS/Delor64K
scc of ANSYS/Delor64K

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  • Matrix group: ANSYS
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  • download as a MATLAB mat-file, file size: 3 MB. Use UFget(2651) or UFget('ANSYS/Delor64K') in MATLAB.
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    Matrix properties
    number of rows64,719
    number of columns1,785,345
    nonzeros652,140
    structural full rank?yes
    structural rank64,719
    # of blocks from dmperm1
    # strongly connected comp.1,623,009
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorE. Delor
    editorT. Davis
    date2011
    kindleast squares problem
    2D/3D problem?no

    Notes:

    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 COLAMD17,136,354
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD2,550,393

    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.