Matrix: Schenk_IBMNA/c-61

Description: IBM TJ Watson, non-linear optimization

Schenk_IBMNA/c-61 graph
(undirected graph drawing)

Schenk_IBMNA/c-61

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Schenk_IBMNA
  • Click here for a description of the Schenk_IBMNA 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: 2 MB. Use UFget(1577) or UFget('Schenk_IBMNA/c-61') in MATLAB.
  • download in Matrix Market format, file size: 1 MB.
  • download in Rutherford/Boeing format, file size: 1 MB.

    Matrix properties
    number of rows43,618
    number of columns43,618
    nonzeros310,016
    structural full rank?yes
    structural rank43,618
    # 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
    date2006
    kindoptimization problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 43618-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD873,487
    Cholesky flop count2.4e+08
    nnz(L+U), no partial pivoting, with AMD1,703,356
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD45,705,890
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD74,091,881

    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.