Matrix: Koutsovasilis/F1

Description: Matrix from Panagiotis Koutsovasilis, Technische Universita(")t Dresden

Koutsovasilis/F1 graph
(undirected graph drawing)


  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Koutsovasilis
  • Click here for a description of the Koutsovasilis 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: 267 MB. Use UFget(1411) or UFget('Koutsovasilis/F1') in MATLAB.
  • download in Matrix Market format, file size: 242 MB.
  • download in Rutherford/Boeing format, file size: 218 MB.

    Matrix properties
    number of rows343,791
    number of columns343,791
    structural full rank?yes
    structural rank343,791
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?no

    authorP. Koutsovasilis
    editorT. Davis
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 343791-by-33


    Stiffness matrix from an AUDI engine crankshaft

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD229,631,530
    Cholesky flop count4.6e+11
    nnz(L+U), no partial pivoting, with AMD458,919,269
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD456,286,024
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,174,873,903

    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.