我的MAIN函数中的代码仅在运行一次时才起作用，但是当我尝试在for循环中运行时它不起作用。我认为在每次迭代结束时重新分配mypop列表都存在一些问题，我正在尝试先清理mypop列表，然后再使用新形成的列表重新分配mypop列表，但这无济于事。我对在Python中建立索引感到非常困惑，并且我假设我每次迭代都使用相同的引用。
def function(x, y):
return x*x + y*y
def initial_pop():
pop1 = np.random.uniform(p1, p2, 20)
pop2 = np.random.uniform(q1, q2, 20)
pop = np.c_[pop1, pop2]
pop = pop.tolist()
return pop
def get_random_pairs(numbers):
pairs = []
taken = []
for i in range(0, 10):
first_item = numbers[random.randrange(len(numbers))]
while first_item in taken:
first_item = numbers[random.randrange(len(numbers))]
taken.append(first_item)
second_item = numbers[random.randrange(len(numbers))]
while second_item in taken:
second_item = numbers[random.randrange(len(numbers))]
taken.append(second_item)
pairs.append([first_item, second_item])
return pairs
def calculate_mean(population):
func_array = []
for x in population:
func_array.append(function(x[0], x[1]))
sum = 0
for x in func_array:
sum += x
mean = sum/len(population)
return mean
def shrinking(pop_, pairs_):
shrank_pop = pop_.copy()
pairs = pairs_.copy()
pop = pop_.copy()
new = []
for pair in pairs:
if function(pair[0][0], pair[0][1]) <= calculate_mean(pop):
for x in shrank_pop:
if x == pair[1]:
new += [[x[0] - 0.1, x[1] - 0.1]]
if x == pair[0]:
new += [[x[0], x[1]]]
if function(pair[0][0], pair[0][1]) >= calculate_mean(pop):
for x in shrank_pop:
if x == pair[1]:
new += [[x[0] + 0.1, x[1] + 0.1]]
if x == pair[0]:
new += [[x[0], x[1]]]
return new
def moving(pop_, pairs_):
moved_pop = pop_.copy()
pop = pop_.copy()
pairs = pairs_.copy()
new = []
for pair in pairs:
x1 = pair[0][0]
y1 = pair[0][1]
x2 = pair[1][0]
y2 = pair[1][1]
x21 = x2 + l*math.cos(angle)
y21 = y2 + l*math.sin(angle)
x11 = x1 + l*math.cos(angle)
y11 = y1 + l*math.sin(angle)
if (y21 > q2) & (x11 > p1) & (x11 <= p2):
y11 = q2 + y11 - q2
x11 = x21
for x in moved_pop:
if x == pair[0]:
new += [[x11, y11]]
if x == pair[1]:
new += [[x21, y21]]
return new
def FormNewPop(mypop):
pairs = get_random_pairs(mypop)
children = []
shrinks = shrinking(mypop, pairs)
moves = moving(mypop, pairs)
children = shrinks + moves
functions = []
for x in children:
functions.append([x[0], x[1], function(x[0], x[1])])
functions_sorted = sorted(functions, key=operator.itemgetter(2))
results = []
for item in functions_sorted:
results.append([item[0], item[1]])
results = results[20:40]
return results
def main():
print("Initial Pop")
mypop = initial_pop()
pairs = get_random_pairs(mypop)
shrinks = shrinking(mypop, pairs)
moves = moving(mypop, pairs)
print(shrinks)
print(moves)
for i in range(1,10):
new = FormNewPop(mypop)
mypop = [new[x] for x in range(20)]
new.clear()
main()