On Sat, Jun 4, 2016 at 6:11 PM, Kwankyu Lee <ekwan...@gmail.com> wrote: > As the discussion of this thread seems to converge to the conclusion that we > need to transfer the function of X.list() to X.elements() or like to avoid > confusion, I still like to add to the following separate issue > >> >> (For matrix X), X.list() returns a list of all the >> >> entries of the matrix, whereas list(X) returned the rows. This is >> >> totally my fault, definitely wrong, and its' in Sage right now. >> > >> > The list of the rows of X is the closest thing to X. So we can >> > understand the current behavior as the "conversion" of a matrix. >> >> >> Huh? Isn't the list of columns isn't just as close? What about the >> list of all elements? What metric for closeness are you using? > > > I think that list(X) is in general a way to get a "list" representation of > object X. Then for matrix X, the list of rows of X is the closest > representation since it keeps a bit of the structure of the matrix. So we > can > > sage: m=matrix(2,[1,2,3,4]) > > sage: m > > [1 2] > > [3 4] > > sage: list(m) > > [(1, 2), (3, 4)] > > sage: matrix(list(m)) > > [1 2] > > [3 4] > > So I don't think the current behavior is so wrong. > It is just unfortunate > that X.list() and list(X) behave differently.
The current behavior is that X.list() returns [1,2,3,4], whereas list(X) returns [(1,2),(3,4)]. It behaves as documented so it is not "wrong". I think it is extremely hard to argue that this is not potentially very confusing to users and does not violate a principle of list surprise. A function like X.elements() that returns [1,2,3,4] would make perfect sense. In fact, Sage's X.list() exists because I was implementing something like Magma's EltSeq function, and Eltseq is a lot closer to .elements() than .list(). I messed up. William > > -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at https://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. -- William (http://wstein.org) -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
