Matrix: Oberwolfach/t2dah_a

Description: Oberwolfach: micropyros thruster, A matrix

Oberwolfach/t2dah_a graph
(undirected graph drawing)


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  • Matrix group: Oberwolfach
  • Click here for a description of the Oberwolfach group.
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  • download as a MATLAB mat-file, file size: 774 KB. Use UFget(1204) or UFget('Oberwolfach/t2dah_a') in MATLAB.
  • download in Matrix Market format, file size: 767 KB.
  • download in Rutherford/Boeing format, file size: 676 KB.

    Matrix properties
    number of rows11,445
    number of columns11,445
    structural full rank?yes
    structural rank11,445
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?no
    positive definite?no

    authorE. Rudnyi
    editorE. Rudnyi
    kindduplicate model reduction problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD491,255
    Cholesky flop count4.1e+07
    nnz(L+U), no partial pivoting, with AMD971,065
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD841,710
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD2,001,083

    SVD-based statistics:
    null space dimension1
    full numerical rank?no
    singular value gap5.96041e+07

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

    Oberwolfach/t2dah_a 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.