DMonniaux wrote: > 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? >
This bug is being tracked here: http://trac.sagemath.org/sage_trac/ticket/7163 Jason -- Jason Grout --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
