NYPA/Maragal_2 graph

Matrix: NYPA/Maragal_2

Description: Rank deficient least squares problem, D. Maragal, NY Power Authority

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  • Matrix group: NYPA
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    NYPA/Maragal_2

    dmperm of NYPA/Maragal_2

    scc of NYPA/Maragal_2

    Matrix properties
    number of rows555
    number of columns350
    nonzeros4,357
    structural full rank?no
    structural rank220
    # of blocks from dmperm13
    # strongly connected comp.110
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorD. Maragal
    editorT. Davis
    date2008
    kindleast squares problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 555-by-1

    Notes:

    rank deficient (rank(A) < sprank(A) < size(A,2))
rank: 171 sprank: 220 columns: 350

    Ordering statistics:AMD METIS
    nnz(V) for QR, upper bound nnz(L) for LU30,077 15,110
    nnz(R) for QR, upper bound nnz(U) for LU10,270 9,703

    Maintained by Tim Davis, last updated 05-Nov-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.