• SJSU Singular Matrix Database
  • Matrix group: JGD_Franz
  • Click here for a description of the JGD_Franz group.
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  • Matrix: JGD_Franz/Franz7
  • Description: Cohomology of various rings, from Matthias Franz, Univ. Konstanz, Germany
  • download as a MATLAB mat-file, file size: 80 KB. Use SJget(657) or SJget('JGD_Franz/Franz7') in MATLAB.
  • download in Matrix Market format, file size: 109 KB.
  • download in Rutherford/Boeing format, file size: 104 KB.


    Routine svd from Matlab (R2008a) used to calculate the singular values.


    scc of JGD_Franz/Franz7

    Matrix properties (click for a legend)  
    number of rows10,164
    number of columns1,740
    structural full rank?yes
    structural rank1,740
    numerical rank 1,627
    dimension of the numerical null space113
    numerical rank / min(size(A))0.93506
    Euclidean norm of A 12.207
    calculated singular value # 16272.3398
    numerical rank defined using a tolerance
    max(size(A))*eps(norm(A)) =
    calculated singular value # 16283.0998e-013
    gap in the singular values at the numerical rank:
    singular value # 1627 / singular value # 1628
    calculated condition number2.0943e+015
    # of blocks from dmperm1
    # strongly connected comp.6
    entries not in dmperm blocks0
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    Cholesky candidate?no
    positive definite?no

    authorM. Franz
    editorJ.-G. Dumas
    kindcombinatorial problem
    2D/3D problem?no


    Cohomology of various rings, from Matthias Franz, Univ. Konstanz, Germany
    From Jean-Guillaume Dumas' Sparse Integer Matrix Collection,             
    Filename in JGD collection: Franz/10164x1740                             

    Ordering statistics:AMD METIS
    nnz(V) for QR, upper bound nnz(L) for LU7,072,949 5,276,835
    nnz(R) for QR, upper bound nnz(U) for LU518,487 540,763

    Maintained by Leslie Foster, last updated 24-Apr-2009.

    Entries 5 through 14 in the table of matrix properties and the singular
    value plot were created using SJsingular code. The other plots
    and statistics are produced using utilities from the SuiteSparse package.
    Matrix color plot pictures by cspy, a MATLAB function in the CSparse package.