Matrix: HB/saylr1

Description: UNSYMMETRIC MATRIX OF PAUL SAYLOR - 14 BY 17 2D GRID MAY, 1983

HB/saylr1 graph
(undirected graph drawing)


HB/saylr1

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 6 KB. Use UFget(239) or UFget('HB/saylr1') in MATLAB.
  • download in Matrix Market format, file size: 7 KB.
  • download in Rutherford/Boeing format, file size: 6 KB.

    Matrix properties
    number of rows238
    number of columns238
    nonzeros1,128
    structural full rank?yes
    structural rank238
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 65%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Kendall, D. Peaceman, H. Stone, W. Watts
    editorP. Saylor
    date1984
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,908
    Cholesky flop count2.0e+04
    nnz(L+U), no partial pivoting, with AMD3,578
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD2,631
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD4,686

    SVD-based statistics:
    norm(A)4.83249e+08
    min(svd(A))0.621097
    cond(A)7.78058e+08
    rank(A)238
    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/saylr1 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.