Matrix: Brogan/specular

Description: specular surface reconstruction problem

Brogan/specular graph
(bipartite graph drawing)

Brogan/specular dmperm of Brogan/specular
scc of Brogan/specular

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  • download as a MATLAB mat-file, file size: 74 MB. Use UFget(2658) or UFget('Brogan/specular') in MATLAB.
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    Matrix properties
    number of rows477,976
    number of columns1,600
    nonzeros7,647,040
    structural full rank?no
    structural rank1,442
    # of blocks from dmperm4
    # strongly connected comp.159
    explicit zero entries576
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorJ. Brogan
    editorT. Davis
    date2014
    kindcomputer vision problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 477976-by-2

    Notes:

    specular surface reconstruction problem        
Submitted by Joel Brogan, Notre Dame, July 2014

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD354,397,422
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD153,667

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 576 explicit zero entries.

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 04-Jun-2015.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.