Is there a fast way to create a submatrix? -------------------------------------------------
sage: version() 'Sage Version 4.0.alpha0, Release Date: 2009-05-15' sage: G = graphs.GridGraph([100,100]) sage: L = G.laplacian_matrix() sage: L 10000 x 10000 sparse matrix over Integer Ring sage: time M = L[1:9999,1:9999] CPU times: user 24.93 s, sys: 0.04 s, total: 24.97 s Wall time: 25.27 s ---------------------------------------------------- I am just interested in deleting a single row and column of the matrix (not necessarily the first). Thanks, Dave --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
