Matrix: Boeing/ct20stif

Description: CT20 ENGINE BLOCK -- STIFFNESS MATRIX

Boeing/ct20stif graph
(undirected graph drawing)


Boeing/ct20stif

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  • Matrix group: Boeing
  • Click here for a description of the Boeing group.
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  • download as a MATLAB mat-file, file size: 17 MB. Use UFget(356) or UFget('Boeing/ct20stif') in MATLAB.
  • download in Matrix Market format, file size: 13 MB.
  • download in Rutherford/Boeing format, file size: 10 MB.

    Matrix properties
    number of rows52,329
    number of columns52,329
    nonzeros2,600,295
    structural full rank?yes
    structural rank52,329
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries98,168
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorR. Grimes
    editorT. Davis
    date1995
    kindstructural problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD10,729,657
    Cholesky flop count7.1e+09
    nnz(L+U), no partial pivoting, with AMD21,406,985
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD26,993,567
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD52,637,780

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 98168 explicit zero entries.

    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.