Matrix: Springer/ESOC

Description: European Space Operations Center orbit estimates

 (bipartite graph drawing)

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• Matrix group: Springer
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• download as a MATLAB mat-file, file size: 49 MB. Use UFget(1860) or UFget('Springer/ESOC') in MATLAB.
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 Matrix properties number of rows 327,062 number of columns 37,830 nonzeros 6,019,939 structural full rank? no structural rank 37,349 # of blocks from dmperm 74 # strongly connected comp. 482 explicit zero entries 0 nonzero pattern symmetry 0% numeric value symmetry 0% type real structure rectangular Cholesky candidate? no positive definite? no

 author T. Springer and F. Dilssner editor T. Davis date 2007 kind least squares problem 2D/3D problem? no

 Ordering statistics: result nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD 1,835,049,395 nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD 33,359,282

 SVD-based statistics: norm(A) 8.04954e+07 min(svd(A)) 0 cond(A) Inf rank(A) 37,349 sprank(A)-rank(A) 0 null space dimension 481 full numerical rank? no singular value gap Inf

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

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.