Matrix: GHS_psdef/copter2

Description: Gould, Hu, & Scott: Helicoptor rotor blade, from Pothen & Kumfert

GHS_psdef/copter2 graph
(undirected graph drawing)


  • Home page of the UF Sparse Matrix Collection
  • Matrix group: GHS_psdef
  • Click here for a description of the GHS_psdef 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: 1 MB. Use UFget(1256) or UFget('GHS_psdef/copter2') in MATLAB.
  • download in Matrix Market format, file size: 993 KB.
  • download in Rutherford/Boeing format, file size: 885 KB.

    Matrix properties
    number of rows55,476
    number of columns55,476
    structural full rank?yes
    structural rank55,476
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?no

    authorG. Kumfert, A. Pothen
    editorN. Gould, Y. Hu, J. Scott
    kindduplicate computational fluid dynamics problem
    2D/3D problem?yes


    GHS_psdef/copter2 is the nonzero pattern of GHS_indef/copter2.

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD13,936,659
    Cholesky flop count1.2e+10
    nnz(L+U), no partial pivoting, with AMD27,817,842
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD32,503,916
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD64,894,256

    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.