I have very sparse systems of equations, with sparse kernels (I mean, if one performs Gaussian elimination, one tends to still obtain a sparse result). Yet when I compute the kernel matrix with Sage, I end up with a dense matrix:
$ sage -v | Sage Version 4.1.1, Release Date: 2009-08-14 sage: m=Matrix(QQ,100,sparse=True) sage: m[0,0]=1 sage: ker=m.right_kernel(sparse=True) sage: ker.basis_matrix() 99 x 100 dense matrix over Rational Field Is this normal? Can I get a sparse matrix instead? --~--~---------~--~----~------------~-------~--~----~ 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 URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
