• 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/cegb2802
  • Description: FINITE ELEMENT PROBLEM. TURBINE BLADE
  • download as a MATLAB mat-file, file size: 85 KB. Use SJget(82) or SJget('HB/cegb2802') in MATLAB.
  • download in Matrix Market format, file size: 300 KB.
  • download in Rutherford/Boeing format, file size: 46 KB.

    HB/cegb2802

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

    HB/cegb2802

    dmperm of HB/cegb2802

    scc of HB/cegb2802

    Matrix properties (click for a legend)  
    number of rows2,802
    number of columns2,802
    structural full rank?no
    structural rank2,694
    numerical rank 289
    dimension of the numerical null space2,513
    numerical rank / min(size(A))0.10314
    Euclidean norm of A 116.72
    calculated singular value # 2890.37257
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    3.9819e-011
    calculated singular value # 2903.598e-013
    gap in the singular values at the numerical rank:
    singular value # 289 / singular value # 290
    1.0355e+012
    calculated condition numberInf
    condestInf
    nonzeros277,362
    # of blocks from dmperm3
    # strongly connected comp.109
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typebinary
    structuresymmetric
    Cholesky candidate?yes
    positive definite?no

    authorA. Donovan
    editorI. Duff, R. Grimes, J. Lewis
    date1980
    kindstructural problem
    2D/3D problem?yes
    SJid82
    UFid1,173

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))235,158 315,762
    Cholesky flop count2.3e+007 4.6e+007
    nnz(L+U), no partial pivoting467,514 628,722
    nnz(V) for QR, upper bound nnz(L) for LU241,773 377,592
    nnz(R) for QR, upper bound nnz(U) for LU525,534 754,773

    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.