questions about functions inside a function
fdu.xiaojf at gmail.com
fdu.xiaojf at gmail.com
Mon Jul 16 11:04:29 EDT 2007
Duncan Booth wrote:
> "fdu.xiaojf at gmail.com" <fdu.xiaojf at gmail.com> wrote:
>
>> In order to make sure all variables be larger than 0, I tried to created
>> constraint function like this:
>>
>> cons = []
>> for i in range(N):
>> c = lambda x: x[i] - 1e-10
>> cons.append(c)
>>
>> But when functions in cons are evaluated, the value in all functions are
>> all the same(N-1, which is the last value of i in the loop).
>>
>> What I want is, when functions in cons be evaluated, every function
>> refers to a different variable in X.
>
> So pass i in as a default value:
>
> for i in range(N):
> def c(x, i=i):
> return x[i] - 1e-10
> cons.append(c)
Thanks all of you have read or replied.
Both Duncan's and Steven's solution work well. Thanks!
I love python, not only because of the language itself, and also the so kind
community!
Xiao Jianfeng
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