Matrix: Sumner/graphics

Description: Bob Sumner, MIT. a computer graphics problem

Sumner/graphics graph
(bipartite graph drawing)


Sumner/graphics

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Sumner
  • Click here for a description of the Sumner group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 889 KB. Use UFget(981) or UFget('Sumner/graphics') in MATLAB.
  • download in Matrix Market format, file size: 1 MB.
  • download in Rutherford/Boeing format, file size: 1 MB.

    Matrix properties
    number of rows29,493
    number of columns11,822
    nonzeros117,954
    structural full rank?yes
    structural rank11,822
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorR. Sumner
    editorT. Davis
    date2003
    kindcomputer graphics/vision problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,602,329
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD124,909

    SVD-based statistics:
    norm(A)3.91854e+08
    min(svd(A))2.46072
    cond(A)1.59244e+08
    rank(A)11,822
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero
    status:ok

    Sumner/graphics 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.