Matrix: Oberwolfach/t3dh

Description: Oberwolfach: micropyros thruster

Oberwolfach/t3dh graph
(undirected graph drawing)


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  • Matrix group: Oberwolfach
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  • download as a MATLAB mat-file, file size: 37 MB. Use UFget(1450) or UFget('Oberwolfach/t3dh') in MATLAB.
  • download in Matrix Market format, file size: 33 MB.
  • download in Rutherford/Boeing format, file size: 27 MB.

    Matrix properties
    number of rows79,171
    number of columns79,171
    structural full rank?yes
    structural rank79,171
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?no
    positive definite?no

    authorE. Rudnyi
    editorE. Rudnyi
    kindmodel reduction problem
    2D/3D problem?yes

    Additional fieldssize and type
    Esparse 79171-by-79171
    Bsparse 79171-by-1
    Csparse 7-by-79171
    cnamefull 7-by-7


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

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD125,237,918
    Cholesky flop count5.2e+11
    nnz(L+U), no partial pivoting, with AMD250,396,665
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD191,253,531
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD388,699,872

    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.