• SJSU Singular Matrix Database
  • Matrix group: HB
  • Click here for a description of the HB group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups


  • Matrix: HB/dwt_878
  • Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON
  • download as a MATLAB mat-file, file size: 13 KB. Use SJget(113) or SJget('HB/dwt_878') in MATLAB.
  • download in Matrix Market format, file size: 8 KB.
  • download in Rutherford/Boeing format, file size: 7 KB.

    HB/dwt_878

    Routine svd from Matlab 7.6.0.324 (R2008a) used to calculate the singular values.

    HB/dwt_878

    Matrix properties (click for a legend)  
    number of rows878
    number of columns878
    structural full rank?yes
    structural rank878
    numerical rank 850
    dimension of the numerical null space28
    numerical rank / min(size(A))0.96811
    Euclidean norm of A 8.9113
    calculated singular value # 8500.017026
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    1.5596e-012
    calculated singular value # 8511.5689e-015
    gap in the singular values at the numerical rank:
    singular value # 850 / singular value # 851
    1.0853e+013
    calculated condition number4.0556e+020
    condestInf
    nonzeros7,448
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorG. Everstine, D. Taylor
    editorI. Duff, R. Grimes, J. Lewis
    date1980
    kindstructural problem
    2D/3D problem?yes
    SJid113
    UFid137

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))14,146 15,337
    Cholesky flop count3.0e+005 3.7e+005
    nnz(L+U), no partial pivoting27,414 29,796
    nnz(V) for QR, upper bound nnz(L) for LU18,445 20,379
    nnz(R) for QR, upper bound nnz(U) for LU34,319 37,894

    Maintained by Leslie Foster, last updated 24-Apr-2009.

    Entries 5 through 14 in the table of matrix properties and the singular
    value plot were created using SJsingular code. The other plots
    and statistics are produced using utilities from the SuiteSparse package.
    Matrix color plot pictures by cspy, a MATLAB function in the CSparse package.