• 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_162
  • Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON
  • download as a MATLAB mat-file, file size: 3 KB. Use SJget(94) or SJget('HB/dwt_162') in MATLAB.
  • download in Matrix Market format, file size: 2 KB.
  • download in Rutherford/Boeing format, file size: 2 KB.

    HB/dwt_162

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

    HB/dwt_162

    Matrix properties (click for a legend)  
    number of rows162
    number of columns162
    structural full rank?yes
    structural rank162
    numerical rank 144
    dimension of the numerical null space18
    numerical rank / min(size(A))0.88889
    Euclidean norm of A 8.1318
    calculated singular value # 1440.10384
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    2.8777e-013
    calculated singular value # 1451.7301e-015
    gap in the singular values at the numerical rank:
    singular value # 144 / singular value # 145
    6.002e+013
    calculated condition number1.0177e+018
    condestInf
    nonzeros1,182
    # 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
    SJid94
    UFid113

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))1,338 1,340
    Cholesky flop count1.2e+004 1.2e+004
    nnz(L+U), no partial pivoting2,514 2,518
    nnz(V) for QR, upper bound nnz(L) for LU1,572 1,430
    nnz(R) for QR, upper bound nnz(U) for LU2,777 2,485

    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.