Matrix: ATandT/twotone

Description: AT&T,harmonic balance method, two-tone. More off-diag nz than onetone

ATandT/twotone graph ATandT/twotone graph
(bipartite graph drawing) (graph drawing of A+A')

ATandT/twotone dmperm of ATandT/twotone
scc of ATandT/twotone

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  • Matrix group: ATandT
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  • download as a MATLAB mat-file, file size: 7 MB. Use UFget(286) or UFget('ATandT/twotone') in MATLAB.
  • download in Matrix Market format, file size: 7 MB.
  • download in Rutherford/Boeing format, file size: 5 MB.

    Matrix properties
    number of rows120,750
    number of columns120,750
    structural full rank?yes
    structural rank120,750
    # of blocks from dmperm13,135
    # strongly connected comp.5
    explicit zero entries17,959
    nonzero pattern symmetry 24%
    numeric value symmetry 11%
    Cholesky candidate?no
    positive definite?no

    authorR. Melville, D. Long
    editorT. Davis
    kindfrequency-domain circuit simulation problem
    2D/3D problem?no

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD33,508,325
    Cholesky flop count6.8e+10
    nnz(L+U), no partial pivoting, with AMD66,895,900
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD7,437,600
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD20,926,670

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 17959 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.