Hi, At present the code for printing the eigenvectors of a matrix gives output in different "formats" depending on the field used. For RDF/CDF, the output appears an a single line.
sage: matrix(CDF, [ [2, 1], [1, 2]]).eigenvectors_right() [(3.0, [(0.707106781187, 0.707106781187)], 1), (1.0, [(0.707106781187, -0.707106781187)], 1)] For other rings such as ZZ, QQ, GF(), the output is split into multiple lines. Essentially, the eigenvectors are printed one vector per line. sage: matrix(ZZ, [ [2, 1], [1, 2]]).eigenvectors_right() [(3, [ (1, 1) ], 1), (1, [ (1, -1) ], 1)] Personally, I feel that the latter output appears "broken," not to mention that the output is inconsistent across different rings. The fix for this is quite simple. One needs to stop passing the parameter "cr=True" when calling this function: Sequence(vecs, universe=V, check = False, immutable=True, cr=True) The question is: should we stop passing the keyword cr=True when printing out eigenvectors of a matrix? Maybe a vote is in order? 1. [ ] Stop passing the keyword cr=True (i.e. make the other fields output as in RDF/CDF) 2. [ ] Stop passing the keyword cr=True but only when called from eigenvectors_right() 3. [ ] Keep the current output format (i.e. don't touch any of this code) 4. [ ] Keep the current output format AND change RDF/CDF to give output similar to the other fields To keep the second option in context, note that eventually Freemodule_submodule_with_basis_field_with_*.basis() is called and it is there that the Sequence(..., cr=True) is called. What the second option proposes is that only the output of eigenvectors_right/left() be changed and the output of the Freemodule*.basis() be left as it is now. My choice would be 2. [x] Stop passing the keyword cr=True but only when called from eigenvectors_right() Relevant ticket: http://trac.sagemath.org/sage_trac/ticket/12514 -- 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
