• UF Sparse Matrix Collection
  • Matrix group: ACUSIM
  • Click here for a description of the ACUSIM group.
  • Click here for a list of all matrices
  • Click here for a list of all matrix groups


  • Matrix: ACUSIM/Pres_Poisson
  • Description: ACUSIM, Inc: computational fluid dynamics problem
  • download as a MATLAB mat-file, file size: 4 MB. Use UFget(1184) or UFget('ACUSIM/Pres_Poisson') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    ACUSIM/Pres_Poisson

    ACUSIM/Pres_Poisson graph

    Matrix properties
    number of rows14,822
    number of columns14,822
    nonzeros715,804
    structural full rank?yes
    structural rank14,822
    # 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

    authorF. Shakib
    editorT. Davis
    date2004
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 14822-by-1

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))2,507,325 2,393,769
    Cholesky flop count6.2e+08 5.5e+08
    nnz(L+U), no partial pivoting4,999,828 4,772,716
    nnz(V) for QR, upper bound nnz(L) for LU2,750,237 3,375,677
    nnz(R) for QR, upper bound nnz(U) for LU5,482,885 6,400,245

    Maintained by Tim Davis, last updated 04-May-2008.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.