• 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_419
  • Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON
  • download as a MATLAB mat-file, file size: 8 KB. Use SJget(104) or SJget('HB/dwt_419') in MATLAB.
  • download in Matrix Market format, file size: 5 KB.
  • download in Rutherford/Boeing format, file size: 4 KB.

    HB/dwt_419

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

    HB/dwt_419

    Matrix properties (click for a legend)  
    number of rows419
    number of columns419
    structural full rank?yes
    structural rank419
    numerical rank 370
    dimension of the numerical null space49
    numerical rank / min(size(A))0.88305
    Euclidean norm of A 9.3391
    calculated singular value # 3700.025481
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    7.4429e-013
    calculated singular value # 3713.127e-015
    gap in the singular values at the numerical rank:
    singular value # 370 / singular value # 371
    8.1486e+012
    calculated condition number2.501e+018
    condestInf
    nonzeros3,563
    # 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
    SJid104
    UFid125

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))5,013 5,724
    Cholesky flop count7.4e+004 1.0e+005
    nnz(L+U), no partial pivoting9,607 11,029
    nnz(V) for QR, upper bound nnz(L) for LU6,487 8,449
    nnz(R) for QR, upper bound nnz(U) for LU13,002 15,437

    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.