Matrix: Oberwolfach/t2dal_a

Description: Oberwolfach: micropyros thruster, A matrix

Oberwolfach/t2dal_a graph
(undirected graph drawing)


Oberwolfach/t2dal_a

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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: 132 KB. Use UFget(1206) or UFget('Oberwolfach/t2dal_a') in MATLAB.
  • download in Matrix Market format, file size: 151 KB.
  • download in Rutherford/Boeing format, file size: 141 KB.

    Matrix properties
    number of rows4,257
    number of columns4,257
    nonzeros37,465
    structural full rank?yes
    structural rank4,257
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorE. Rudnyi
    editorE. Rudnyi
    date2004
    kindduplicate model reduction problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD115,326
    Cholesky flop count5.5e+06
    nnz(L+U), no partial pivoting, with AMD226,395
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD180,860
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD336,323

    SVD-based statistics:
    norm(A)145.643
    min(svd(A))7.4683e-15
    cond(A)1.95014e+16
    rank(A)4,256
    sprank(A)-rank(A)1
    null space dimension1
    full numerical rank?no
    singular value gap4.93698e+07

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

    Oberwolfach/t2dal_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.