Crossing lists in python

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Crossing lists in python

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#1 by (0 votes)

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Good night, I'm breaking my head to find the error, is the following I'm crossing this list of binary numbers, the first crossing is working but the second is getting the end of the first, to exemplify this is my my list of entry:

SELECTED POPULATION

['1', '0', '1', '0', '1', '0']
['1', '0', '1', '1', '1', '1']
['1', '1', '0', '0', '0', '1']
['0', '0', '0', '0', '1', '1']
['1', '0', '1', '0', '1', '0']
['1', '0', '1', '0', '1', '0']
['1', '0', '1', '0', '1', '0']
['0', '0', '1', '0', '0', '1']
['1', '0', '1', '0', '1', '0']
['1', '0', '1', '0', '1', '0']

These are the ones that will cross in pairs (father and mother):

CROSSOVER

 INDICES: [0, 1, 2, 3, 4, 6, 7, 8]
 Corte em: 6
 Pai: ['1', '0', '1', '0', '1', '0']
 Mae: ['1', '0', '1', '1', '1', '1']
 Corte em: 2
 Pai: ['1', '1', '0', '0', '0', '1']
 Mae: ['0', '0', '0', '0', '1', '1']
 Corte em: 1
 Pai: ['1', '0', '1', '0', '1', '0']
 Mae: ['1', '0', '1', '0', '1', '0']
 Corte em: 2
 Pai: ['0', '0', '1', '0', '0', '1']
 Mae: ['1', '0', '1', '0', '1', '0']

And this is my output that is wrong:

CROSSOVER POPULATION

['1', '0', '1', '0', '1', '0']
['1', '0', '1', '1', '1', '1']
['1', '1', '0', '0', '1', '1']
['0', '0', '0', '0', '1', '1']
['1', '0', '1', '0', '1', '0']
['1', '0', '1', '0', '1', '0']
['1', '0', '1', '0', '1', '0']
['0', '0', '1', '0', '1', '0']
['1', '0', '1', '0', '1', '0']
['1', '0', '1', '0', '1', '0']

CODE

def crossover(probCrossover):
    indices = []
    randoms = []

    print('\nCROSSOVER')
    print('-----'*6)
    for i in range(len(populacao)):
        randoms.append(random())

    for i , r in enumerate(randoms):
        if r <= probCrossover:
            indices.append(i)

    if len(indices)%2!=0:
        indices.pop()
    print('\nINDICES: {}'.format(indices))
    for ind in range(0, len(indices), 2):

        pontoCorte = randint(1, precind)
        print('Corte em: {}'.format(pontoCorte))
        print('Pai: {}\nMae: {}'.format(populacao[indices[ind]], populacao[indices[ind+1]]))

        populacao.__setitem__(indices[ind], populacao[indices[ind]][0:pontoCorte]+populacao[indices[ind+1]][pontoCorte:])
        populacao.__setitem__(indices[ind+1], populacao[indices[ind+1]][0:pontoCorte]+populacao[indices[ind]][pontoCorte:])

python-3.x

asked by anonymous 17.06.2018 / 20:55

1 answer

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score 0 · Answer 1

I was able to solve my problem, in fact it was very simple, I was using the setitem in the list, then how the code to modify were together and when changing the first one the second would use it already modified and this caused the error in the output. As a solution I created two variables filho1 and filho2 that receive the changed item and then changed in the list.

SOLUTION:

def crossover(probCrossover):
     indices = []
     randoms = []

     print('\nCROSSOVER')
     print('-----'*6)
     for i in range(len(populacao)):
        randoms.append(random())

     for i , r in enumerate(randoms):
         if r <= probCrossover:
             indices.append(i)

     if len(indices)%2!=0:
         indices.pop()
     print('\nINDICES: {}'.format(indices))
     for ind in range(0, len(indices), 2):

         pontoCorte = randint(1, precind)
         print('Corte em: {}'.format(pontoCorte))
         print('Pai: {}\nMae: {}'.format(populacao[indices[ind]], populacao[indices[ind+1]]))
         filho1 = populacao[indices[ind]][0:pontoCorte]+populacao[indices[ind+1]][pontoCorte:]
         filho2 = populacao[indices[ind+1]][0:pontoCorte]+populacao[indices[ind]][pontoCorte:]

         populacao.__setitem__(indices[ind], filho1)
         populacao.__setitem__(indices[ind+1], filho2)