Matrix: Nasa/nasasrb

Description: STRUCTURE FROM NASA LANGLEY, SHUTTLE ROCKET BOOSTER

Nasa/nasasrb graph
(undirected graph drawing)

Nasa/nasasrb

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  • Matrix group: Nasa
  • Click here for a description of the Nasa group.
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  • download as a MATLAB mat-file, file size: 15 MB. Use UFget(761) or UFget('Nasa/nasasrb') in MATLAB.
  • download in Matrix Market format, file size: 12 MB.
  • download in Rutherford/Boeing format, file size: 10 MB.

    Matrix properties
    number of rows54,870
    number of columns54,870
    nonzeros2,677,324
    structural full rank?yes
    structural rank54,870
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorNASA
    editorG. Kumfert, A. Pothen
    date1995
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 54870-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD11,953,582
    Cholesky flop count4.8e+09
    nnz(L+U), no partial pivoting, with AMD23,852,294
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD25,076,207
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD48,490,189

    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.