Matrix: MathWorks/tomography

Description: The MathWorks, Inc: Earth science matrix, from David Yang

MathWorks/tomography graph
(undirected graph drawing)

MathWorks/tomography dmperm of MathWorks/tomography

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: MathWorks
  • Click here for a description of the MathWorks group.
  • Click here for a list of all matrices
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  • download as a MATLAB mat-file, file size: 184 KB. Use UFget(1328) or UFget('MathWorks/tomography') in MATLAB.
  • download in Matrix Market format, file size: 271 KB.
  • download in Rutherford/Boeing format, file size: 233 KB.

    Matrix properties
    number of rows500
    number of columns500
    structural full rank?yes
    structural rank500
    # of blocks from dmperm37
    # strongly connected comp.37
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 93%
    Cholesky candidate?no
    positive definite?no

    editorT. Davis
    kindcomputer graphics/vision problem
    2D/3D problem?yes

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD19,344
    Cholesky flop count1.1e+06
    nnz(L+U), no partial pivoting, with AMD38,188
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD38,081
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD106,630

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

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

    MathWorks/tomography 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.