Matrix: Pothen/mesh2e1

Description: mesh2e1, with coordinates. From NASA, collected by Alex Pothen

Pothen/mesh2e1 graph
(undirected graph drawing)


Pothen/mesh2e1
Pothen/mesh2e1 graph

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  • Matrix group: Pothen
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  • download as a MATLAB mat-file, file size: 19 KB. Use UFget(875) or UFget('Pothen/mesh2e1') in MATLAB.
  • download in Matrix Market format, file size: 13 KB.
  • download in Rutherford/Boeing format, file size: 15 KB.

    Matrix properties
    number of rows306
    number of columns306
    nonzeros2,018
    structural full rank?yes
    structural rank306
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    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 306-by-2

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD3,224
    Cholesky flop count4.4e+04
    nnz(L+U), no partial pivoting, with AMD6,142
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,706
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD8,460

    SVD-based statistics:
    norm(A)381.301
    min(svd(A))1.31316
    cond(A)290.369
    rank(A)306
    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/mesh2e1 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.