Matrix: Koutsovasilis/F1

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

Koutsovasilis/F1 graph
(undirected graph drawing)

Koutsovasilis/F1

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  • Matrix group: Koutsovasilis
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  • 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
    nonzeros26,837,113
    structural full rank?yes
    structural rank343,791
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorP. Koutsovasilis
    editorT. Davis
    date2006
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 343791-by-33

    Notes:

    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

    Maintained by Tim Davis, last updated 01-Apr-2011.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.