CODEWITHSUNDEEP
pythonlistrandommutation
user10608627
user10608627

Reputation:

Python: Randomly mix two lists

I'm having some trouble mixing two lists together to make a new list of the same length.

So far I have randomly selected two lists from a bunch of lists called parent 1 and parent 2. This is what I have so far but the output_list line doesn't work.

parent1 = listname[random.randint(1,popsize)]
parent2 = listname[random.randint(1,popsize)]
output_list = random.choice(concatenate([parent1,parent2]), length, replace=False)
print(output_list)

The outcome I want is: if parent1 = [1,2,3,4,5] and parent2 = [6,7,8,9,10] then a possible outcome could be [1,2,3,9,10] or [1,7,2,5,6] or [1,2,7,4,5].

Anybody have any ideas?

(the context is two sets of genes which breed to form a child with a mix of the parents genes)

Upvotes: 1

Views: 534

Answers (2)

Nelson G.
Nelson G.

Reputation: 5441

When you construct genetic algorithms, it is preferable a value from a parent keeps the same index in child array, like genes in chromosomes.

You can performs that with numpy :

import numpy as np
male = np.random.choice(100, 5)   # array([25, 90, 25, 96, 91])
female = np.random.choice(100, 5) # array([98, 19, 17, 78, 29])
np.choose(np.random.choice(2, 5), [male, female])
# array([98, 19, 25, 96, 29])
np.choose(np.random.choice(2, 5), [male, female])
# array([25, 90, 25, 78, 29])

Upvotes: 0

slider
slider

Reputation: 12990

You can use random.shuffle after concatenating parent_1 and parent_2 and pick a slice of the same length as parent_1:

import random

parent_1 = [1,2,3,4,5]
parent_2 = [6,7,8,9,10]

c = parent_1 + parent_2
random.shuffle(c)

result = c[:len(parent_1)]
print(result) # [4, 5, 10, 6, 9]

Upvotes: 3

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