• UF Sparse Matrix Collection
  • Matrix group: MathWorks
  • Click here for a description of the MathWorks group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups

  • Matrix: MathWorks/pivtol
  • Description: Spline toolbox. Pivot tol 0.1 fails, needs >= 0.26. MathWorks,Inc
  • download as a MATLAB mat-file, file size: 3 KB. Use UFget(861) or UFget('MathWorks/pivtol') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    MathWorks/pivtol

    MathWorks/pivtol graph

    Matrix properties
    number of rows102
    number of columns102
    nonzeros306
    structural full rank?yes
    structural rank102
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 99%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorB. Cheng
    editorT. Davis
    date2002
    kindstatistical/mathematical problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 102-by-3

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))303 303
    Cholesky flop count9.0e+02 9.0e+02
    nnz(L+U), no partial pivoting504 504
    nnz(V) for QR, upper bound nnz(L) for LU304 334
    nnz(R) for QR, upper bound nnz(U) for LU500 530

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.