Matrix: HB/orsreg_1

Description: U OIL RESERVOIR SIMULATION MATRIX FOR 21X21X 5 FULL GRID

HB/orsreg_1 graph
(undirected graph drawing)


HB/orsreg_1

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 27 KB. Use UFget(227) or UFget('HB/orsreg_1') in MATLAB.
  • download in Matrix Market format, file size: 51 KB.
  • download in Rutherford/Boeing format, file size: 31 KB.

    Matrix properties
    number of rows2,205
    number of columns2,205
    nonzeros14,133
    structural full rank?yes
    structural rank2,205
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 41%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Grimes
    editorI. Duff, R. Grimes, J. Lewis
    date1984
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD78,182
    Cholesky flop count6.7e+06
    nnz(L+U), no partial pivoting, with AMD154,159
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD160,695
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD284,815

    SVD-based statistics:
    norm(A)29272.5
    min(svd(A))4.3397
    cond(A)6745.27
    rank(A)2,205
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

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

    HB/orsreg_1 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.