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

  • Matrix: HB/bcspwr04
  • Description: SYMMETRIC STRUCTURE EQUIVALENCED REPRESENTATION OF U.S. POWER NETWORK
  • download as a MATLAB mat-file, file size: 3 KB. Use UFget(16) or UFget('HB/bcspwr04') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    HB/bcspwr04

    HB/bcspwr04 graph

    Matrix properties
    number of rows274
    number of columns274
    nonzeros1,612
    structural full rank?yes
    structural rank274
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorB. Dembart, J. Lewis
    editorI. Duff, R. Grimes, J. Lewis
    date1981
    kindpower network problem
    2D/3D problem?no

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))1,331 1,440
    Cholesky flop count8.2e+03 1.0e+04
    nnz(L+U), no partial pivoting2,388 2,606
    nnz(V) for QR, upper bound nnz(L) for LU1,835 2,221
    nnz(R) for QR, upper bound nnz(U) for LU3,790 4,516

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.