Matrix: FEMLAB/poisson3Db

Description: Comsol, Inc. : 3D Poisson problem

FEMLAB/poisson3Db graph
(undirected graph drawing)


  • Home page of the 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
  • download as a MATLAB mat-file, file size: 23 MB. Use UFget(928) or UFget('FEMLAB/poisson3Db') in MATLAB.
  • download in Matrix Market format, file size: 30 MB.
  • download in Rutherford/Boeing format, file size: 29 MB.

    Matrix properties
    number of rows85,623
    number of columns85,623
    structural full rank?yes
    structural rank85,623
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

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

    Additional fieldssize and type
    bfull 85623-by-1

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD57,304,935
    Cholesky flop count1.3e+11
    nnz(L+U), no partial pivoting, with AMD114,524,247
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD112,727,554
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD270,263,178

    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.