Matrix: Bai/tols2000

Description: TOLOSA MATRIX

Bai/tols2000 graph Bai/tols2000 graph
(bipartite graph drawing) (graph drawing of A+A')

Bai/tols2000 dmperm of Bai/tols2000
scc of Bai/tols2000

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Bai
  • Click here for a description of the Bai 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: 27 KB. Use UFget(1638) or UFget('Bai/tols2000') in MATLAB.
  • download in Matrix Market format, file size: 30 KB.
  • download in Rutherford/Boeing format, file size: 28 KB.

    Matrix properties
    number of rows2,000
    number of columns2,000
    structural full rank?yes
    structural rank2,000
    # of blocks from dmperm1,983
    # strongly connected comp.1,529
    explicit zero entries0
    nonzero pattern symmetry 34%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorS. Godet-Thobie
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD4,977
    Cholesky flop count3.5e+04
    nnz(L+U), no partial pivoting, with AMD7,954
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,479
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD7,533

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

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

    Bai/tols2000 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.