[Tutor] problems with the bisect method

[Mic Forster]

It's still not obtaining the value that I need. I'll
go back and rethink this from first basis.


--- "antonmuhin at rambler.ru" <antonmuhin@rambler.ru>
wrote:
> Hello Mic,
> 
> Wednesday, March 5, 2003, 6:16:00 AM, you wrote:
> 
> [snip]
> 
> >>>> def fun(k, s):
> MF>         return f(k, s) - j
> 
> >>>> delta = 1e-9
> >>>> bisect(delta, 1-delta, delta, fun)
> MF> Traceback (most recent call last):
> MF>   File "<pyshell#10>", line 1, in ?
> MF>     bisect(delta, 1-delta, delta, fun)
> MF>   File "<pyshell#5>", line 2, in bisect
> MF>     fMax = function(max)
> MF> TypeError: fun() takes exactly 2 arguments (1
> given)
> >>>> 
> 
> Quite reasonable I must say :). Your function fun
> takes couple of
> arguments---k and s and f too althouh s argument
> seems to be unused.
> 
> You may modify it as:
> 
> def f(x):
>     return ...
> 
> def fun(k):
>     return f(k) - j
> 
> Or write a wrapper function:
> 
> def wrapFun(x):
>     return fun(x, some constant goes here)
> 
> Or even with lambda:
> 
> bisect(delta, 1 - delta, delta, lambda x: fun(x,
> smth...))
> 
> BTW, although you script is quite short, you'd
> better avoid global
> variables like j.
> 
> If you need a set of functions like fun. Python can
> provide with
> better (IMHO) options:
> 
> 1. def makeFun(j):
>        def newF(x):
>            f(x) - j
>        return newF
> 
> 2. Lambdas again: myF = lambda x: f(x) - j
> 
> -- 
> Best regards,
>  anton                           
> mailto:antonmuhin@rambler.ru
> 


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