Matrix: Sandia/init_adder1

Description: Sandia/init_adder1 circuit simulation matrix. Sandia National Lab.

Sandia/init_adder1 graph Sandia/init_adder1 graph
(bipartite graph drawing) (graph drawing of A+A')


Sandia/init_adder1 dmperm of Sandia/init_adder1
scc of Sandia/init_adder1

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  • Matrix group: Sandia
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  • download as a MATLAB mat-file, file size: 45 KB. Use UFget(1108) or UFget('Sandia/init_adder1') in MATLAB.
  • download in Matrix Market format, file size: 59 KB.
  • download in Rutherford/Boeing format, file size: 46 KB.

    Matrix properties
    number of rows1,813
    number of columns1,813
    nonzeros11,156
    structural full rank?yes
    structural rank1,813
    # of blocks from dmperm469
    # strongly connected comp.6
    explicit zero entries0
    nonzero pattern symmetry 65%
    numeric value symmetry 2%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorR. Hoekstra
    editorT. Davis
    date2003
    kindcircuit simulation problem sequence
    2D/3D problem?no

    Notes:

    next: Sandia/adder_dcop_01 first: Sandia/init_adder1
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD12,043
    Cholesky flop count9.9e+04
    nnz(L+U), no partial pivoting, with AMD22,273
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD239,978
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD1,057,180

    SVD-based statistics:
    norm(A)1.01806
    min(svd(A))3.11774e-08
    cond(A)3.2654e+07
    rank(A)1,813
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

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

    Sandia/init_adder1 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.