Matrix: GHS_indef/stokes128

Description: Gould, Hu, & Scott: Stokes equation, from Mario Arioli

GHS_indef/stokes128 graph
(undirected graph drawing)


GHS_indef/stokes128

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: GHS_indef
  • Click here for a description of the GHS_indef group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 1 MB. Use UFget(1246) or UFget('GHS_indef/stokes128') in MATLAB.
  • download in Matrix Market format, file size: 1 MB.
  • download in Rutherford/Boeing format, file size: 864 KB.

    Matrix properties
    number of rows49,666
    number of columns49,666
    nonzeros558,594
    structural full rank?yes
    structural rank49,666
    # 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

    authorM. Arioli
    editorN. Gould, Y. Hu, J. Scott
    date2004
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,421,899
    Cholesky flop count3.8e+08
    nnz(L+U), no partial pivoting, with AMD4,794,132
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD5,316,111
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD12,061,998

    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.