On 2/25/14 12:25 PM, Jeff Denny wrote:
My students are attempting to use a python function with an if statement in it as part of a differential equation they are solving with desolve_odeint. Unfortunately, of course, Sage executes the python function as soon as they write it and not within the solver. I need help on getting around this. Here is some same code for a simpler case than what they are doing.def f(x,y): if x<0.2: return(0) else: return(y*(1-y)) ans=desolve_odeint([SR(1),f(x,y)],[0,0.5],srange(0,10,0.01),[x,y])
I'll note that my first reaction, to call desolve_odeint with just f instead of f(x,y), gives an error about f not having a variables method:
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