• 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/problem1
  • Description: Comsol, Inc. www.femlab.com : small test problem
  • download as a MATLAB mat-file, file size: 21 KB. Use UFget(929) or UFget('FEMLAB/problem1') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    FEMLAB/problem1

    FEMLAB/problem1 graph

    Matrix properties
    number of rows415
    number of columns415
    nonzeros2,779
    structural full rank?yes
    structural rank415
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetry 65%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorCOMSOL
    editorT. Davis
    date2003
    kind2D/3D problem
    2D/3D problem?yes

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))4,539 5,005
    Cholesky flop count6.5e+04 8.1e+04
    nnz(L+U), no partial pivoting8,663 9,595
    nnz(V) for QR, upper bound nnz(L) for LU6,699 7,102
    nnz(R) for QR, upper bound nnz(U) for LU12,480 13,044

    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.