sage: L = [[2,4,16],[1/2,1,2],[1,1,1]] sage: A = matrix(RDF, L) sage: xvalues = [sqrt(2), 2, 4]
sage: L2 = [[i^2 for i in xvalues], [log(i, 2) for i in xvalues], [1 for i in xvalues]] sage: A2 = matrix(RDF, L2) sage: print (A - A2).norm() 1.11022302463e-16 sage: b = vector(RDF, [5, 20, 106]) sage: print A.solve_right(b) (153.25, -37.875, -9.375) sage: print A.inverse() * b (153.25, -37.875, -9.375) sage: print A2.solve_right(b) (128.0, -32.0, -9.375) sage: print A2.inverse() * b (153.25, -37.875, -9.375) The third output is quite off and I don't think it can be attributed to numerical error. Any idea what is happening? Rado -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
