Matrix: Schmid/thermal2

Description: unstructured FEM, steady state thermal problem. Dani Schmid, Univ. Oslo

Schmid/thermal2 graph
(undirected graph drawing)

Schmid/thermal2 dmperm of Schmid/thermal2

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  • download as a MATLAB mat-file, file size: 71 MB. Use UFget(1403) or UFget('Schmid/thermal2') in MATLAB.
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    Matrix properties
    number of rows1,228,045
    number of columns1,228,045
    nonzeros8,580,313
    structural full rank?yes
    structural rank1,228,045
    # of blocks from dmperm959
    # strongly connected comp.959
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorD. Schmid
    editorT. Davis
    date2006
    kindthermal problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 1228045-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD64,896,306
    Cholesky flop count2.8e+10
    nnz(L+U), no partial pivoting, with AMD128,564,567
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD135,142,876
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD250,322,077

    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.