Are you aware of the function piecewise(), which seems to do what you want? If there is a problem with using it, what is it?
M. Hampton On Jul 21, 12:34 pm, Doug <mcke...@gmail.com> wrote: > I'm trying to do something that seems very simple but isn't working. > Hence the post here :) > > I want to define a very simple piecewise linear function. It's linear > with slope alpha up to a knot at c and then it's linear with slope > beta. Here's what I thought might work: > > f(x) = (x<=c)*alpha*x + (x>c)*(alpha*c + beta*(x-c)) > > Putting the inequalities in there caused a big mess. So I tried > defining a Python Indicator function that turns Truth values into 0 or > 1, and then I wrapped my relational expressions with it: > > def Indicator(cond): > if (cond==True): > return 1 > else: > return 0 > > This didn't work either: > > sage: foo(x) = Indicator(x>4) ; foo > x |--> 0 > > Any other ideas? I suppose I could in this case define my piecewise > function as a Python function, but then I won't be able to do as much > with it later (e.g., differentiate it). > > Thx as usual, Doug --~--~---------~--~----~------------~-------~--~----~ 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 URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
