• UF Sparse Matrix Collection
  • Matrix group: MathWorks
  • Click here for a description of the MathWorks group.
  • Click here for a list of all matrices
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  • Matrix: MathWorks/Pd
  • Description: Matrix problem X=A\B with many sparse right-hand-sides
  • download as a MATLAB mat-file, file size: 63 KB. Use UFget(1170) or UFget('MathWorks/Pd') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    MathWorks/Pd

    dmperm of MathWorks/Pd

    MathWorks/Pd graph

    Matrix properties
    number of rows8,081
    number of columns8,081
    nonzeros13,036
    structural full rank?yes
    structural rank8,081
    # of blocks from dmperm7,877
    # strongly connected comp.7,877
    entries not in dmperm blocks4,734
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorP. Anderson
    editorT. Davis
    date2002
    kindcounter-example problem
    2D/3D problem?no

    Additional fieldssize and type
    bsparse 8081-by-12406

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))14,340 15,025 8,480
    Cholesky flop count3.1e+04 3.6e+04 9.7e+03
    nnz(L+U), no partial pivoting20,599 21,969 13,613
    nnz(V) for QR, upper bound nnz(L) for LU11,635 11,279 8,285
    nnz(R) for QR, upper bound nnz(U) for LU15,465 16,059 13,218

    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.