Matrix: Pothen/tandem_vtx

Description: tandem_vtx, with coordinates. From NASA, collected by Alex Pothen

Pothen/tandem_vtx graph
(undirected graph drawing)

Pothen/tandem_vtx graph

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Pothen
  • Click here for a description of the Pothen 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: 569 KB. Use UFget(886) or UFget('Pothen/tandem_vtx') in MATLAB.
  • download in Matrix Market format, file size: 445 KB.
  • download in Rutherford/Boeing format, file size: 384 KB.

    Matrix properties
    number of rows18,454
    number of columns18,454
    structural full rank?yes
    structural rank18,454
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?no

    editorG. Kumfert, A. Pothen
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    coordfull 18454-by-3

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,697,614
    Cholesky flop count1.0e+09
    nnz(L+U), no partial pivoting, with AMD5,376,774
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,783,934
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD9,113,158

    SVD-based statistics:
    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

    Pothen/tandem_vtx 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.