Matrix: Oberwolfach/t2dal_e

Description: Oberwolfach: micropyros thruster, E matrix

Oberwolfach/t2dal_e graph
(undirected graph drawing)

Oberwolfach/t2dal_e dmperm of Oberwolfach/t2dal_e

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  • Matrix group: Oberwolfach
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  • download as a MATLAB mat-file, file size: 25 KB. Use UFget(1207) or UFget('Oberwolfach/t2dal_e') in MATLAB.
  • download in Matrix Market format, file size: 39 KB.
  • download in Rutherford/Boeing format, file size: 33 KB.

    Matrix properties
    number of rows4,257
    number of columns4,257
    structural full rank?yes
    structural rank4,257
    # of blocks from dmperm4,257
    # strongly connected comp.4,257
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorE. Rudnyi
    editorE. Rudnyi
    kindduplicate model reduction problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD4,257
    Cholesky flop count4.3e+03
    nnz(L+U), no partial pivoting, with AMD4,257
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD4,257
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD4,257

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

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;

    Oberwolfach/t2dal_e 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.