Matrix: Bydder/mri2

Description: MRI reconstruction (2), from Mark Bydder, UCSD

Bydder/mri2 graph
(bipartite graph drawing)

Bydder/mri2 dmperm of Bydder/mri2
scc of Bydder/mri2

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Bydder
  • Click here for a description of the Bydder group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 5 MB. Use UFget(1318) or UFget('Bydder/mri2') in MATLAB.
  • download in Matrix Market format, file size: 8 MB.
  • download in Rutherford/Boeing format, file size: 7 MB.

    Matrix properties
    number of rows63,240
    number of columns147,456
    nonzeros569,160
    structural full rank?no
    structural rank48,321
    # of blocks from dmperm438
    # strongly connected comp.42,860
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typereal
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorM. Bydder
    editorT. Davis
    date2005
    kindcomputer graphics/vision problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 63240-by-1

    Notes:

    x = lsqr (A,b) ; imagesc (abs (fftshift (fft2 (reshape (x, 384, 384))))) ;

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD454,179,957
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD39,755,949

    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.