Matrix: Nasa/nasa2146

Description: STRUCTURE FROM NASA LANGLEY, 2146 DEGREES OF FREEDOM

Nasa/nasa2146 graph
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Nasa/nasa2146

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  • Matrix group: Nasa
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  • download as a MATLAB mat-file, file size: 516 KB. Use UFget(758) or UFget('Nasa/nasa2146') in MATLAB.
  • download in Matrix Market format, file size: 413 KB.
  • download in Rutherford/Boeing format, file size: 344 KB.

    Matrix properties
    number of rows2,146
    number of columns2,146
    nonzeros72,250
    structural full rank?yes
    structural rank2,146
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?yes
    positive definite?yes

    authorNASA
    editorG. Kumfert, A. Pothen
    date1995
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 2146-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD139,943
    Cholesky flop count1.2e+07
    nnz(L+U), no partial pivoting, with AMD277,740
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD240,781
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD473,182

    SVD-based statistics:
    norm(A)3.27282e+07
    min(svd(A))18980.2
    cond(A)1724.34
    rank(A)2,146
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    Nasa/nasa2146 svd

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.