Matrix: Oberwolfach/gas_sensor

Description: Oberwolfach: microhotplate gas sensor

Oberwolfach/gas_sensor graph
(undirected graph drawing)


Oberwolfach/gas_sensor

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  • Matrix group: Oberwolfach
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  • download as a MATLAB mat-file, file size: 9 MB. Use UFget(1434) or UFget('Oberwolfach/gas_sensor') in MATLAB.
  • download in Matrix Market format, file size: 8 MB.
  • download in Rutherford/Boeing format, file size: 7 MB.

    Matrix properties
    number of rows66,917
    number of columns66,917
    nonzeros1,703,365
    structural full rank?yes
    structural rank66,917
    # of blocks from dmperm1
    # strongly connected comp.1
    explicit zero entries0
    nonzero pattern symmetrysymmetric
    numeric value symmetrysymmetric
    typereal
    structuresymmetric
    Cholesky candidate?no
    positive definite?no

    authorJ. Hildenbrand
    editorE. Rudnyi
    date2004
    kindmodel reduction problem
    2D/3D problem?yes

    Additional fieldssize and type
    Esparse 66917-by-66917
    Bsparse 66917-by-1
    Csparse 28-by-66917
    cnamefull 28-by-7

    Notes:

    Primary matrix in this model reduction problem is the Oberwolfach A matrix
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD55,993,092
    Cholesky flop count1.2e+11
    nnz(L+U), no partial pivoting, with AMD111,919,267
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD86,330,206
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD154,029,283

    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.