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


  • Matrix: FEMLAB/poisson3Db
  • Description: Comsol, Inc. www.femlab.com : 3D Poisson problem
  • download as a MATLAB mat-file, file size: 23 MB. Use UFget(928) or UFget('FEMLAB/poisson3Db') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    FEMLAB/poisson3Db

    FEMLAB/poisson3Db graph

    Matrix properties
    number of rows85,623
    number of columns85,623
    nonzeros2,374,949
    structural full rank?yes
    structural rank85,623
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorCOMSOL
    editorT. Davis
    date2003
    kindcomputational fluid dynamics problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 85623-by-1

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))57,304,935 31,948,502
    Cholesky flop count1.3e+11 3.5e+10
    nnz(L+U), no partial pivoting114,524,247 63,811,381
    nnz(V) for QR, upper bound nnz(L) for LU112,727,554 80,520,056
    nnz(R) for QR, upper bound nnz(U) for LU270,263,178 201,140,351

    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.