Matrix: JGD_BIBD/bibd_18_9

Description: Balanced Incomplete Block Design from Mark Giesbrecht, Univ. of Waterloo

JGD_BIBD/bibd_18_9 graph
(bipartite graph drawing)


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  • download as a MATLAB mat-file, file size: 1 MB. Use UFget(1934) or UFget('JGD_BIBD/bibd_18_9') in MATLAB.
  • download in Matrix Market format, file size: 4 MB.
  • download in Rutherford/Boeing format, file size: 1 MB.

    Matrix properties
    number of rows153
    number of columns48,620
    structural full rank?yes
    structural rank153
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorM. Giesbrecht
    editorJ.-G. Dumas
    kindcombinatorial problem
    2D/3D problem?no


    Balanced Incomplete Block Design from Mark Giesbrecht, Univ. of Waterloo
    From Jean-Guillaume Dumas' Sparse Integer Matrix Collection,                      
    Filename in JGD collection: BIBD/bibd_18_9_153x48620.sms                

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD6,671,412
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD11,781

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

    singular values (MAT file):click here
    SVD method used:s = svd (full (R)) ; where [~,R,E] = spqr (A') with droptol of zero

    JGD_BIBD/bibd_18_9 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.