Matrix: Boeing/msc23052

Description: SYMMETRIC TEST MATRIX FROM MSC/NASTRAN SHOCKF8.OUT2

Boeing/msc23052 graph
(undirected graph drawing)


Boeing/msc23052

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Boeing
  • Click here for a description of the Boeing group.
  • Click here for a list of all matrices
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  • download as a MATLAB mat-file, file size: 8 MB. Use UFget(362) or UFget('Boeing/msc23052') in MATLAB.
  • download in Matrix Market format, file size: 6 MB.
  • download in Rutherford/Boeing format, file size: 5 MB.

    Matrix properties
    number of rows23,052
    number of columns23,052
    nonzeros1,142,686
    structural full rank?yes
    structural rank23,052
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries12,128
    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 AMD2,777,057
    Cholesky flop count6.3e+08
    nnz(L+U), no partial pivoting, with AMD5,531,062
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD7,670,285
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD15,776,044

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 12128 explicit zero entries.

    SVD-based statistics:
    norm(A)7.10158e+08
    min(svd(A))0.000955374
    cond(A)7.43329e+11
    rank(A)23,020
    sprank(A)-rank(A)32
    null space dimension32
    full numerical rank?no
    singular value gap1.03425

    singular values (MAT file):click here
    SVD method used:s = svd (full (A))
    status:ok

    Boeing/msc23052 svd

    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.