Nasa/nasa4704 graph

Matrix: Nasa/nasa4704

Description: STRUCTURE FROM NASA LANGLEY, 4704 DEGREES OF FREEDOM

  • UF Sparse Matrix Collection
  • Matrix group: Nasa
  • Click here for a description of the Nasa group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups
  • download as a MATLAB mat-file, file size: 489 KB. Use UFget(760) or UFget('Nasa/nasa4704') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Nasa/nasa4704

    Matrix properties
    number of rows4,704
    number of columns4,704
    nonzeros104,756
    structural full rank?yes
    structural rank4,704
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    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 4704-by-1

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))283,225 301,609
    Cholesky flop count3.7e+07 3.9e+07
    nnz(L+U), no partial pivoting561,746 598,514
    nnz(V) for QR, upper bound nnz(L) for LU671,166 507,640
    nnz(R) for QR, upper bound nnz(U) for LU1,320,652 977,358

    Maintained by Tim Davis, last updated 30-Sep-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.