• 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_198
  • Description: SYMMETRIC CONNECTION TABLE FROM DTNSRDC, WASHINGTON
  • download as a MATLAB mat-file, file size: 3 KB. Use SJget(96) or SJget('HB/dwt_198') in MATLAB.
  • download in Matrix Market format, file size: 2 KB.
  • download in Rutherford/Boeing format, file size: 2 KB.

    HB/dwt_198

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

    HB/dwt_198

    dmperm of HB/dwt_198

    Matrix properties (click for a legend)  
    number of rows198
    number of columns198
    structural full rank?yes
    structural rank198
    numerical rank 192
    dimension of the numerical null space6
    numerical rank / min(size(A))0.9697
    Euclidean norm of A 8.243
    calculated singular value # 1920.033621
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    3.5172e-013
    calculated singular value # 1939.2626e-016
    gap in the singular values at the numerical rank:
    singular value # 192 / singular value # 193
    3.6298e+013
    calculated condition number7.9118e+016
    condestInf
    nonzeros1,392
    # of blocks from dmperm6
    # strongly connected comp.6
    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
    SJid96
    UFid115

    Ordering statistics:AMD METIS DMPERM+
    nnz(chol(P*(A+A'+s*I)*P'))1,275 1,243 1,262
    Cholesky flop count9.5e+003 8.9e+003 9.2e+003
    nnz(L+U), no partial pivoting2,352 2,288 2,326
    nnz(V) for QR, upper bound nnz(L) for LU1,349 1,679 1,394
    nnz(R) for QR, upper bound nnz(U) for LU2,340 2,549 2,220

    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.