i want to change this python program to matlab

Question

yared Zeleke 2018-4-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/392466-i-want-to-change-this-python-program-to-matlab

评论： yared Zeleke 2018-4-10

在 MATLAB Online 中打开

import random

import string

target = "Hello, World!"

def calc_fitness(source, target):

    fitval = 0
    for i in range(0, len(source)):
        fitval += (ord(target[i]) - ord(source[i])) ** 2
    return(fitval)

def mutate(parent1, parent2):

    child_dna = parent1['dna'][:]
    # Mix both DNAs
    start = random.randint(0, len(parent2['dna']) - 1)
    stop = random.randint(0, len(parent2['dna']) - 1)
    if start > stop:
        stop, start = start, stop
    child_dna[start:stop] = parent2['dna'][start:stop]
    # Mutate one position
    charpos = random.randint(0, len(child_dna) - 1)
    child_dna[charpos] = chr(ord(child_dna[charpos]) + random.randint(-1,1))
    child_fitness = calc_fitness(child_dna, target)
    return({'dna': child_dna, 'fitness': child_fitness})

def random_parent(genepool):

    wRndNr = random.random() * random.random() * (GENSIZE - 1)
    wRndNr = int(wRndNr)
    return(genepool[wRndNr])

def dump_genepool(generation, genepool):

    for candidate in genepool:
        print "%6i %6i %15s" % (
            generation,
            candidate['fitness'],
            ''.join(candidate['dna'])
        )
    print

GENSIZE = 20

genepool = []

for i in range(0, GENSIZE):

    dna = [random.choice(string.printable[:-5]) for j in range(0, len(target))]
    fitness = calc_fitness(dna, target)
    candidate = {'dna': dna, 'fitness': fitness }
    genepool.append(candidate)

generation = 0

while True:

    generation += 1
    genepool.sort(key=lambda candidate: candidate['fitness'])
    dump_genepool(generation, genepool)
    if genepool[0]['fitness'] == 0:
        # Target reached
        break
    parent1 = random_parent(genepool)
    parent2 = random_parent(genepool)
    child = mutate(parent1, parent2)
    if child['fitness'] < genepool[-1]['fitness']:
        genepool[-1] = child