Matrix: Oberwolfach/rail_79841

Description: Oberwolfach: heat transfer, steel profile cooling

Oberwolfach/rail_79841 graph
(undirected graph drawing)


Oberwolfach/rail_79841

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  • Matrix group: Oberwolfach
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  • download as a MATLAB mat-file, file size: 3 MB. Use UFget(1445) or UFget('Oberwolfach/rail_79841') in MATLAB.
  • download in Matrix Market format, file size: 4 MB.
  • download in Rutherford/Boeing format, file size: 3 MB.

    Matrix properties
    number of rows79,841
    number of columns79,841
    nonzeros553,921
    structural full rank?yes
    structural rank79,841
    # 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

    authorP. Benner, J. Saak
    editorE. Rudnyi
    date2002
    kindmodel reduction problem
    2D/3D problem?yes

    Additional fieldssize and type
    Esparse 79841-by-79841
    Bsparse 79841-by-7
    Csparse 6-by-79841

    Notes:

    Primary matrix in this model reduction problem is the Oberwolfach A matrix
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,733,147
    Cholesky flop count1.4e+08
    nnz(L+U), no partial pivoting, with AMD3,386,453
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,639,030
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD10,074,013

    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.