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

  • Matrix: Langemyr/comsol
  • Description: FEM, structural mechanics. Lars Langemyr, COMSOL. May need pivtol>0.1
  • download as a MATLAB mat-file, file size: 668 KB. Use UFget(864) or UFget('Langemyr/comsol') in MATLAB.
  • download in Matrix Market format
  • download in Rutherford/Boeing format

    Langemyr/comsol

    Langemyr/comsol graph

    Matrix properties
    number of rows1,500
    number of columns1,500
    nonzeros97,645
    structural full rank?yes
    structural rank1,500
    # of blocks from dmperm1
    # strongly connected comp.1
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 100%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorL. Langemyr
    editorT. Davis
    date2002
    kindstructural problem
    2D/3D problem?yes

    Additional fieldssize and type
    bfull 1500-by-1

    Ordering statistics:AMD METIS
    nnz(chol(P*(A+A'+s*I)*P'))107,541 146,485
    Cholesky flop count8.5e+06 1.8e+07
    nnz(L+U), no partial pivoting213,582 291,470
    nnz(V) for QR, upper bound nnz(L) for LU117,814 213,699
    nnz(R) for QR, upper bound nnz(U) for LU301,962 459,903

    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.