Matrix: Hohn/fd12

Description: M. Hohn, Univ Utah. Single-material crack problem, finite diff log grid

Hohn/fd12 graph Hohn/fd12 graph
(bipartite graph drawing) (graph drawing of A+A')

Hohn/fd12 dmperm of Hohn/fd12

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  • Matrix group: Hohn
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  • download as a MATLAB mat-file, file size: 77 KB. Use UFget(917) or UFget('Hohn/fd12') in MATLAB.
  • download in Matrix Market format, file size: 129 KB.
  • download in Rutherford/Boeing format, file size: 103 KB.

    Matrix properties
    number of rows7,500
    number of columns7,500
    structural full rank?yes
    structural rank7,500
    # of blocks from dmperm713
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorM. Hohn
    editorT. Davis
    kindmaterials problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 7500-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,821,871
    Cholesky flop count1.5e+09
    nnz(L+U), no partial pivoting, with AMD3,636,242
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD228,914
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD443,492

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

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:SVD did not converge.

    Hohn/fd12 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.