Description: circuitscape: circuit theory applied to animal/gene flow. B. McRae, UCSB
|(undirected graph drawing)|
|number of rows||1,000,000|
|number of columns||1,000,000|
|structural full rank?||yes|
|# of blocks from dmperm||1|
|# strongly connected comp.||1|
|explicit zero entries||0|
|nonzero pattern symmetry||symmetric|
|numeric value symmetry||symmetric|
Landscape ecology problem, using electrical network theory to model animal movement an gene flow. The McRae/ecology1 matrix comes from a 2D, 1000-by-1000 mesh (5 pt stencil). It is an ill-conditioned symmetric indefinite matrix. Source: Brad McRae, National Center for Ecological Analysis and Synthesis Santa Barbara, CA.
|nnz(chol(P*(A+A'+s*I)*P')) with AMD||44,674,783|
|Cholesky flop count||1.8e+10|
|nnz(L+U), no partial pivoting, with AMD||88,349,566|
|nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD||74,067,950|
|nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD||135,597,872|
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.