Matrix: Freescale/memchip

Description: Memory chip from K. Gullapalli, Freescale Semiconductor

Freescale/memchip graph Freescale/memchip graph
(bipartite graph drawing) (graph drawing of A+A')

Freescale/memchip dmperm of Freescale/memchip
scc of Freescale/memchip

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  • Matrix group: Freescale
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  • download as a MATLAB mat-file, file size: 72 MB. Use UFget(2274) or UFget('Freescale/memchip') in MATLAB.
  • download in Matrix Market format, file size: 118 MB.
  • download in Rutherford/Boeing format, file size: 96 MB.

    Matrix properties
    number of rows2,707,524
    number of columns2,707,524
    nonzeros13,343,948
    structural full rank?yes
    structural rank2,707,524
    # of blocks from dmperm63
    # strongly connected comp.53
    explicit zero entries1,466,254
    nonzero pattern symmetry 91%
    numeric value symmetry 40%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorK. Gullapalli
    editorT. Davis
    date2010
    kindcircuit simulation problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD66,322,438
    Cholesky flop count5.5e+10
    nnz(L+U), no partial pivoting, with AMD129,937,352
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD82,474,020
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD153,263,242

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1466254 explicit zero entries.

    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.