Matrix: GHS_indef/c-70

Description: Schenk: IBM TJ Watson, Yorktown, nonlinear optimization

GHS_indef/c-70 graph
(undirected graph drawing)

GHS_indef/c-70

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: GHS_indef
  • Click here for a description of the GHS_indef group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 4 MB. Use UFget(1227) or UFget('GHS_indef/c-70') in MATLAB.
  • download in Matrix Market format, file size: 3 MB.
  • download in Rutherford/Boeing format, file size: 3 MB.

    Matrix properties
    number of rows68,924
    number of columns68,924
    nonzeros658,986
    structural full rank?yes
    structural rank68,924
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorIBM
    editorO. Schenk
    date2004
    kindoptimization problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 68924-by-1

    Notes:

    Revised Nov 2006; relative eps changes to A, right-hand-side added.
Note that this matrix should have been placed in the Schenk_IBMNA/ 
directory when it was first added in August 2004, but moving it now
would disrupt exising users of the collection.

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD4,049,264
    Cholesky flop count3.6e+09
    nnz(L+U), no partial pivoting, with AMD8,029,604
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD248,746,883
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD317,851,414

    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.