Matrix: Bydder/mri1

Description: MRI reconstruction (1), from Mark Bydder, UCSD

Bydder/mri1 graph
(bipartite graph drawing)

Bydder/mri1 dmperm of Bydder/mri1
scc of Bydder/mri1

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  • download as a MATLAB mat-file, file size: 5 MB. Use UFget(1317) or UFget('Bydder/mri1') in MATLAB.
  • download in Matrix Market format, file size: 7 MB.
  • download in Rutherford/Boeing format, file size: 7 MB.

    Matrix properties
    number of rows65,536
    number of columns147,456
    structural full rank?no
    structural rank64,517
    # of blocks from dmperm258
    # strongly connected comp.32,820
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

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

    Additional fieldssize and type
    bfull 65536-by-1


    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 COLAMD90,338,640
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD7,148,111

    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.