Matrix: CEMW/t2em

Description: Electromagnetics problem, David Isaak, Computational_EM_Works

CEMW/t2em graph CEMW/t2em graph
(bipartite graph drawing) (graph drawing of A+A')

CEMW/t2em dmperm of CEMW/t2em

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  • Matrix group: CEMW
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  • download as a MATLAB mat-file, file size: 7 MB. Use UFget(1897) or UFget('CEMW/t2em') in MATLAB.
  • download in Matrix Market format, file size: 15 MB.
  • download in Rutherford/Boeing format, file size: 10 MB.

    Matrix properties
    number of rows921,632
    number of columns921,632
    structural full rank?yes
    structural rank921,632
    # of blocks from dmperm4,333
    # strongly connected comp.4,333
    explicit zero entries0
    nonzero pattern symmetry 100%
    numeric value symmetry 100%
    Cholesky candidate?no
    positive definite?no

    authorD. Isaak
    editorT. Davis
    kindelectromagnetics problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD42,877,751
    Cholesky flop count2.1e+10
    nnz(L+U), no partial pivoting, with AMD84,833,870
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD102,283,265
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD185,871,732

    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.