Matrix: Cunningham/qa8fk

Description: 3D acoustic FE stiffness matrix. A. Cunningham, Vibro-Acoustic Sciences Inc

Cunningham/qa8fk graph
(undirected graph drawing)

Cunningham/qa8fk graph

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  • Matrix group: Cunningham
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  • download as a MATLAB mat-file, file size: 3 MB. Use UFget(844) or UFget('Cunningham/qa8fk') in MATLAB.
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    Matrix properties
    number of rows66,127
    number of columns66,127
    structural full rank?yes
    structural rank66,127
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?no

    authorA. Cunningham
    editorT. Davis
    kindacoustics problem
    2D/3D problem?yes

    Additional fieldssize and type
    coordfull 66127-by-3

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD40,460,476
    Cholesky flop count6.3e+10
    nnz(L+U), no partial pivoting, with AMD80,854,825
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD64,111,504
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD116,073,102

    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.