Matrix: JGD_G5/IG5-6

Description: Decomposable subspaces at degree d of the invariant ring of G5, Nicolas Thiery.

JGD_G5/IG5-6 graph
(bipartite graph drawing)


JGD_G5/IG5-6
scc of JGD_G5/IG5-6

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  • download as a MATLAB mat-file, file size: 2 KB. Use UFget(1965) or UFget('JGD_G5/IG5-6') in MATLAB.
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    Matrix properties
    number of rows30
    number of columns77
    nonzeros251
    structural full rank?yes
    structural rank30
    # of blocks from dmperm1
    # strongly connected comp.35
    explicit zero entries0
    nonzero pattern symmetry 0%
    numeric value symmetry 0%
    typeinteger
    structurerectangular
    Cholesky candidate?no
    positive definite?no

    authorN. Thiery
    editorJ.-G. Dumas
    date2008
    kindcombinatorial problem
    2D/3D problem?no

    Notes:

    Decomposable subspaces at degree d of the invariant ring of G5, Nicolas Thiery.
    Univ. Paris Sud.                                                               
                                                                                   
    From Jean-Guillaume Dumas' Sparse Integer Matrix Collection,                   
    http://ljk.imag.fr/membres/Jean-Guillaume.Dumas/simc.html                      
                                                                                   
    http://www.lapcs.univ-lyon1.fr/~nthiery/LinearAlgebra/                         
                                                                                   
    Linear Algebra for combinatorics                                               
                                                                                   
    Abstract:  Computations in algebraic combinatorics often boils down to         
    sparse linear algebra over some exact field. Such computations are             
    usually done in high level computer algebra systems like MuPAD or              
    Maple, which are reasonnably efficient when the ground field requires          
    symbolic computations. However, when the ground field is, say Q  or            
    Z/pZ, the use of external specialized libraries becomes necessary. This        
    document, geared toward developpers of such libraries, present a brief         
    overview of my needs, which seems to be fairly typical in the                  
    community.                                                                     
                                                                                   
    IG5-6: 30 x 77 : rang = 30  (Iteratif: 0.01 s, Gauss: 0.01 s)                  
    IG5-7: 62 x 150 : rang = 62  (Iteratif: 0.02 s, Gauss: 0.01 s)                 
    IG5-8: 156 x 292 : rang = 154  (Iteratif: 0.08 s, Gauss: 0.01 s)               
    IG5-9: 342 x 540 : rang = 308  (Iteratif: 0.46 s, Gauss: 0.02 s)               
    IG5-10: 652 x 976 : rang = 527  (Iteratif: 2.1 s, Gauss: 0.07 s)               
    IG5-11: 1227 x 1692 : rang = 902  (Iteratif: 7.5 s, Gauss: 0.22 s)             
    IG5-12: 2296 x 2875 : rang = 1578  (Iteratif: 26 s, Gauss: 0.93 s)             
    IG5-13: 3994 x 4731 : rang = 2532  (Iteratif: 80 s, Gauss: 3.35 s)             
    IG5-14: 6727 x 7621 : rang = 3906  (Iteratif: 244 s, Gauss: 10.06 s)           
    IG5-15: 11358 x 11987 : rang = 6146  (Iteratif: s, Gauss: 29.74 s)             
    IG5-16: 18485 x 18829 : rang = 9519  (Iteratif: s, Gauss: 621.97 s)            
    IG5-17: 27944 x 30131 : rang = 14060  (Iteratif: s, Gauss: 1973.8 s)           
                                                                                   
    Filename in JGD collection: G5/IG5-6.txt2                                      
    

    Ordering statistics:result
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD461
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD400

    SVD-based statistics:
    norm(A)28.3867
    min(svd(A))0.181445
    cond(A)156.449
    rank(A)30
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (R)) ; where [~,R,E] = spqr (A') with droptol of zero
    status:ok

    JGD_G5/IG5-6 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.