Matrix: Bai/ck400

Description: CHUCK MATRIX (MULTIPLE EIGENVALUES) J. CULLUM

Bai/ck400 graph Bai/ck400 graph
(bipartite graph drawing) (graph drawing of A+A')


Bai/ck400 dmperm of Bai/ck400

  • 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: 22 KB. Use UFget(307) or UFget('Bai/ck400') in MATLAB.
  • download in Matrix Market format, file size: 23 KB.
  • download in Rutherford/Boeing format, file size: 20 KB.

    Matrix properties
    number of rows400
    number of columns400
    nonzeros2,860
    structural full rank?yes
    structural rank400
    # of blocks from dmperm2
    # strongly connected comp.2
    explicit zero entries0
    nonzero pattern symmetry 99%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorJ. Cullum
    editorZ. Bai, D. Day, J. Demmel, J. Dongarra
    date1986
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,648
    Cholesky flop count7.8e+03
    nnz(L+U), no partial pivoting, with AMD2,896
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD1,667
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD2,776

    SVD-based statistics:
    norm(A)5.73204
    min(svd(A))2.21131e-05
    cond(A)259215
    rank(A)400
    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

    Bai/ck400 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.