Matrix: Muite/Chebyshev4

Description: Integration matrix, Chebyshev method, 4th order semilinear initial BVP

Muite/Chebyshev4 graph Muite/Chebyshev4 graph
(bipartite graph drawing) (graph drawing of A+A')


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  • Matrix group: Muite
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  • download as a MATLAB mat-file, file size: 29 MB. Use UFget(1867) or UFget('Muite/Chebyshev4') in MATLAB.
  • download in Matrix Market format, file size: 48 MB.
  • download in Rutherford/Boeing format, file size: 40 MB.

    Matrix properties
    number of rows68,121
    number of columns68,121
    structural full rank?yes
    structural rank68,121
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetry 30%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorB. Muite
    editorT. Davis
    kindstructural problem
    2D/3D problem?yes


    Chebyshev integration matrix from Benson Muite, Oxford.  Details of the  
    matrices can be found in a preprint at  
    entitled "A comparison of Chebyshev methods for solving fourth-order     
    semilinear initial boundary value problems," June 2007.   These matrices 
    are very ill-conditioned, partly because of the dense rows which are hard
    to scale when coupled with the rest of the matrix.                       

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD22,994,095
    Cholesky flop count1.6e+10
    nnz(L+U), no partial pivoting, with AMD45,920,069
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD118,684,230
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD2,320,269,381

    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.