Matrix: JGD_BIBD/bibd_15_7

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

JGD_BIBD/bibd_15_7 graph
(bipartite graph drawing)


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  • Matrix group: JGD_BIBD
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  • download as a MATLAB mat-file, file size: 110 KB. Use UFget(1928) or UFget('JGD_BIBD/bibd_15_7') in MATLAB.
  • download in Matrix Market format, file size: 283 KB.
  • download in Rutherford/Boeing format, file size: 109 KB.

    Matrix properties
    number of rows105
    number of columns6,435
    structural full rank?yes
    structural rank105
    # 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_15_7_105x6435.sms                 

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD578,695
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD5,565

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

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

    JGD_BIBD/bibd_15_7 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.