Matrix: Pothen/mesh3em5

Description: mesh3em5, with coordinates. From NASA, collected by Alex Pothen

Pothen/mesh3em5 graph
(undirected graph drawing)


Pothen/mesh3em5
Pothen/mesh3em5 graph

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  • Matrix group: Pothen
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  • download as a MATLAB mat-file, file size: 4 KB. Use UFget(878) or UFget('Pothen/mesh3em5') in MATLAB.
  • download in Matrix Market format, file size: 5 KB.
  • download in Rutherford/Boeing format, file size: 3 KB.

    Matrix properties
    number of rows289
    number of columns289
    nonzeros1,377
    structural full rank?yes
    structural rank289
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries512
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorNASA
    editorG. Kumfert, A. Pothen
    date2003
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    coordfull 289-by-2

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD2,433
    Cholesky flop count2.8e+04
    nnz(L+U), no partial pivoting, with AMD4,577
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,468
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD6,184

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 512 explicit zero entries.

    SVD-based statistics:
    norm(A)4.96595
    min(svd(A))1
    cond(A)4.96595
    rank(A)289
    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

    Pothen/mesh3em5 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.