Matrix: Sandia/fpga_dcop_04

Description: Sandia/fpga_dcop_04 circuit simulation matrix. Sandia National Lab.

Sandia/fpga_dcop_04 graph Sandia/fpga_dcop_04 graph
(bipartite graph drawing) (graph drawing of A+A')

Sandia/fpga_dcop_04 dmperm of Sandia/fpga_dcop_04
scc of Sandia/fpga_dcop_04

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  • download as a MATLAB mat-file, file size: 44 KB. Use UFget(1058) or UFget('Sandia/fpga_dcop_04') in MATLAB.
  • download in Matrix Market format, file size: 60 KB.
  • download in Rutherford/Boeing format, file size: 55 KB.

    Matrix properties
    number of rows1,220
    number of columns1,220
    structural full rank?yes
    structural rank1,220
    # of blocks from dmperm189
    # strongly connected comp.34
    explicit zero entries0
    nonzero pattern symmetry 82%
    numeric value symmetry 35%
    Cholesky candidate?no
    positive definite?no

    authorR. Hoekstra
    editorT. Davis
    kindsubsequent circuit simulation problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 1220-by-1


    next: Sandia/fpga_dcop_05 first: Sandia/fpga_dcop_01

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD5,524
    Cholesky flop count2.8e+04
    nnz(L+U), no partial pivoting, with AMD9,828
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD10,629
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD26,882

    SVD-based statistics:
    null space dimension11
    full numerical rank?no
    singular value gap15.8995

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

    Sandia/fpga_dcop_04 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.