It sounds like what you're saying is "I want a function, but I don't want a function." Perhaps I could offer some better suggestions if I understood why "def f(...)" isn't acceptable.
On Wed, Feb 8, 2012 at 1:16 AM, Chappman <chappman....@gmail.com> wrote: > Yes I do want a function of some sort here, but I do not want a "def > chaps(u,v)" like what anton has done for now, both for my simplified > and larger problem. > Is there a solution/method to this? > > Kind Regards > Chappman > > On Feb 7, 9:35 pm, Robert Bradshaw <rober...@math.washington.edu> > wrote: >> On Tue, Feb 7, 2012 at 1:07 PM, Chappman <chappman....@gmail.com> wrote: >> > Hi Rob, >> > I am pretty new to Sage and am not used to the syntex, so even though >> > I write [y1,y2] , i do not mean it as a list. >> > Basically what I am trying to do is try and get the folllowing code to >> > work, if the summation does come out correct ly >> > x would be equal to 5 , i.e. x=5. >> >> Sage will interpret [y1, y2] as a list (as will others reading your code). >> >> >> >> >> >> >> >> >> >> > I would not need to specify when y1<y2 because I have made a rule in >> > my summation that y2 in [1..y1], so y2 can never be bigger than y1. >> >> > So the way I want my code to work is basically, when doing the >> > summation, the first one would be [y1,y2] = [1,1], then using my >> > previously set criteries >> >> > if y1=y2: >> > [y1,y2]=2 >> > elif y1>y2: >> > [y1,y2]=1 >> >> > this would make [y1,y2] = [1,1]=2 >> > my second summation would be [y1,y2] = [2,1]=1 >> > my last summation would be [y1,y2] = [2,2]=2 >> >> > so then x += [y1,y2] = 5 >> >> > ------------------------------------- >> > if y1=y2: >> > [y1,y2]=2 >> > elif y1>y2: >> > [y1,y2]=1 >> >> > x=0 >> > for y1 in [1..2]: >> > for y2 in [1..y1]: >> > x += [y1,y2] >> > print x >> > ------------------------------------- >> >> > Is there a method of not using a function like "def chap(u,v)" for >> > this right now, because this is just a simplified problem, of my >> > larger problem. Thank you for taking your time looking at this. >> >> If I understand your intent correctly, you do want a function here, >> both for the simplified and larger problem. Is there a reason that >> this doesn't work for you? >> >> >> >> >> >> >> >> > On Feb 7, 8:07 pm, Anton Sherwood <bro...@pobox.com> wrote: >> >> On 2012-2-07 01:18, Chappman wrote: >> >> >> > Hi Rob, >> >> >> > with this syntex: >> >> >> >> x=0 >> >> >> for y_1 in [1..2]: >> >> >> for y_2 in [1..y_1]: >> >> >> x += [y_1,y_2] >> >> >> print x >> >> >> > what I am trying to do is, trying to use the two numbers y_1 and y_2 >> >> > in x +=[y_1,y_2] >> >> > to assign it a number from previously set conditions >> >> >> >> if y_1 = y_2: >> >> >> y_1 = y_2 = 2 >> >> >> elif y_1>y_2: >> >> >> y_1 = y_2 = 1 >> >> >> > but currently my code is having trouble doing that. >> >> > Is there a way to do this please? >> >> >> Are you trying to define [u,v] as a function whose value is 2 if the >> >> arguments are equal and 1 if u>v? (What if v<u?) Among other syntactic >> >> problems, you can't do that with [], because that symbol is reserved for >> >> lists. >> >> >> Here's how I'd do what I think you're trying to do: >> >> >> # define a function of two inputs >> >> def chap(u,v): >> >> if u==v: return 2 >> >> # no 'else' needed, because 'return' breaks out of the function >> >> if u>v: return 1 >> >> return None # ought to be a numeric value >> >> >> x=0 >> >> for y1 in range(1,3): >> >> for y2 in range(1,y1+1): >> >> x += chap(y1,y2) >> >> print x >> >> >> -- >> >> Anton Sherwood *\\*www.bendwavy.org*\\*www.zazzle.com/tamfang >> >> > -- >> > To post to this group, send email to sage-support@googlegroups.com >> > To unsubscribe from this group, send email to >> > sage-support+unsubscr...@googlegroups.com >> > For more options, visit this group >> > athttp://groups.google.com/group/sage-support >> > URL:http://www.sagemath.org > > -- > To post to this group, send email to sage-support@googlegroups.com > To unsubscribe from this group, send email to > sage-support+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-support > URL: http://www.sagemath.org -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
