Matrix: Hamm/add20

Description: 20-bit adder, from Steve Hamm (Motorola)

Hamm/add20 graph
(undirected graph drawing)


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  • Matrix group: Hamm
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  • download as a MATLAB mat-file, file size: 103 KB. Use UFget(539) or UFget('Hamm/add20') in MATLAB.
  • download in Matrix Market format, file size: 147 KB.
  • download in Rutherford/Boeing format, file size: 132 KB.

    Matrix properties
    number of rows2,395
    number of columns2,395
    structural full rank?yes
    structural rank2,395
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries4,168
    nonzero pattern symmetrysymmetric
    numeric value symmetry 53%
    Cholesky candidate?no
    positive definite?no

    authorS. Hamm
    editorT. Davis
    kindcircuit simulation problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 2395-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD9,777
    Cholesky flop count7.4e+04
    nnz(L+U), no partial pivoting, with AMD17,159
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD43,284
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD101,299

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 4168 explicit zero entries.

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;

    Hamm/add20 svd

    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.