Matrix: GHS_indef/dixmaanl

Description: Gould, Hu, & Scott: Dixon-Maany optimization example (CUTEr)

GHS_indef/dixmaanl graph
(undirected graph drawing)


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  • Matrix group: GHS_indef
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  • download as a MATLAB mat-file, file size: 1 MB. Use UFget(1302) or UFget('GHS_indef/dixmaanl') in MATLAB.
  • download in Matrix Market format, file size: 984 KB.
  • download in Rutherford/Boeing format, file size: 812 KB.

    Matrix properties
    number of rows60,000
    number of columns60,000
    structural full rank?yes
    structural rank60,000
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?no

    authorL. Dixon, Z. Maany
    editorP. Toint
    kindoptimization problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD349,980
    Cholesky flop count2.1e+06
    nnz(L+U), no partial pivoting, with AMD639,960
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD359,987
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD719,928

    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.