• 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_492
  • Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON
  • download as a MATLAB mat-file, file size: 8 KB. Use SJget(105) or SJget('HB/dwt_492') in MATLAB.
  • download in Matrix Market format, file size: 4 KB.
  • download in Rutherford/Boeing format, file size: 4 KB.

    HB/dwt_492

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

    HB/dwt_492

    dmperm of HB/dwt_492

    Matrix properties (click for a legend)  
    number of rows492
    number of columns492
    structural full rank?yes
    structural rank492
    numerical rank 488
    dimension of the numerical null space4
    numerical rank / min(size(A))0.99187
    Euclidean norm of A 7.8062
    calculated singular value # 4880.0016192
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    4.3698e-013
    calculated singular value # 4891.8143e-015
    gap in the singular values at the numerical rank:
    singular value # 488 / singular value # 489
    8.925e+011
    calculated condition number1.1514e+017
    condestInf
    nonzeros3,156
    # of blocks from dmperm2
    # strongly connected comp.2
    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
    SJid105
    UFid126

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))2,678 3,024 2,678
    Cholesky flop count1.6e+004 2.2e+004 1.6e+004
    nnz(L+U), no partial pivoting4,864 5,556 4,864
    nnz(V) for QR, upper bound nnz(L) for LU3,042 3,888 3,164
    nnz(R) for QR, upper bound nnz(U) for LU6,014 7,378 5,816

    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.