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


  • Matrix: Pereyra/landmark
  • Description: Matrix from Victor Pereyra, Stanford University
  • download as a MATLAB mat-file, file size: 6 MB. Use UFget(903) or UFget('Pereyra/landmark') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Pereyra/landmark

    dmperm of Pereyra/landmark

    scc of Pereyra/landmark

    Matrix properties
    number of rows71,952
    number of columns2,704
    nonzeros1,146,848
    structural full rank?no
    structural rank2,673
    # of blocks from dmperm5
    # strongly connected comp.32
    explicit zero entries4,384
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorV. Pereyra
    editorT. Davis
    date2003
    kindleast squares problem
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(V) for QR, upper bound nnz(L) for LU119,169,475 24,615,284
    nnz(R) for QR, upper bound nnz(U) for LU1,544,068 291,082

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 4384 explicit zero entries.

    Maintained by Tim Davis, last updated 05-Mar-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.