Matrix: Mittelmann/rail4284

Description: Italian railways (H. Mittelmann test set)

Mittelmann/rail4284 graph
(bipartite graph drawing)

scc of Mittelmann/rail4284

  • Home page of the UF Sparse Matrix Collection
  • Matrix group: Mittelmann
  • Click here for a description of the Mittelmann 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: 9 MB. Use UFget(1658) or UFget('Mittelmann/rail4284') in MATLAB.
  • download in Matrix Market format, file size: 27 MB.
  • download in Rutherford/Boeing format, file size: 11 MB.

    Matrix properties
    number of rows4,284
    number of columns1,096,894
    structural full rank?yes
    structural rank4,284
    # of blocks from dmperm1
    # strongly connected comp.5
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorP. Nobili
    editorJ. Beasley
    kindlinear programming problem
    2D/3D problem?no

    Additional fieldssize and type
    bfull 4284-by-1
    cfull 1096894-by-1
    lofull 1096894-by-1
    hifull 1096894-by-1
    z0full 1-by-1


    Hans Mittelmann test set,
    minimize c'*x, subject to A*x=b and lo <= x <= hi           
    RAIL: set covering problems from the Italian railroad, see  

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD2,598,055,511
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD6,256,119

    SVD-based statistics:
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = piro_band_svd (A)

    Mittelmann/rail4284 svd

    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.