I literally wrote the following at the top of my module:
#\lambda^(i) from Carrell-Goulding paper
def i_part(self,i):
if i==0:
return self
elif i<0:
return (self.conjugate().i_part(-i)).conjugate()
zero_one_sequence = self.zero_one_sequence()
num_ones = zero_one_sequence.count(1)
if num_ones < i:
zero_one_sequence += (i-num_ones)*[1]
index_one_list = [index for index in range(len(zero_one_sequence)) if
zero_one_sequence[index] == 1]
zero_one_sequence[index_one_list[i-1]]=0
return Partitions().from_zero_one(zero_one_sequence)
Partition.i_part = i_part
Then if later I wrote:
p = Partition([3,2,1])
I can call
p.i_part(2)
This works. I just want to know whether there is a better or more standard
solution.
When you say a new __init__ would be good, how do you mean to implement
that?
Dinakar
On Thursday, June 5, 2014 1:11:36 PM UTC-4, kcrisman wrote:
>
>
>> I want to know the best practices for extending the functionality of a
>> sage class. For example, I would like to add the following method to the
>> Partition class in sage:
>>
>> #\lambda^(i) from Carrell-Goulding paper
>> def i_part(self,i):
>> if i==0:
>> return self
>> elif i<0:
>> return (self.conjugate().i_part(-i)).conjugate()
>> zero_one_sequence = self.zero_one_sequence()
>> num_ones = zero_one_sequence.count(1)
>> if num_ones < i:
>> zero_one_sequence += (i-num_ones)*[1]
>> index_one_list = [index for index in range(len(zero_one_sequence)) if
>> zero_one_sequence[index] == 1]
>> zero_one_sequence[index_one_list[i-1]]=0
>> return Partitions().from_zero_one(zero_one_sequence)
>>
>>
>> My first inclination is to subclass Partition and add this as a method to
>> the subclass. However, I am not able to make this work.
>>
>>
> What exactly did you write? A new initialize (__init__) would be a good
> first step.
>
>
>> So what I have done so far is to just include the above function
>> definition in a module followed by the following line:
>>
>> Partition.i_part = i_part
>>
>> So I am dynamically changing the Partition class. This doesn't seem like
>> a good practice in general, so I would like to know what is the preferred
>> solution.
>>
>> Dinakar
>>
>
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