将以下代码转化为python：function newpop=zselect(pop,popsize,fitness) sumfit=sum(fitness); pfit=fitness./sumfit; %每个个体的选择概率 pfit=cumsum(pfit);%累积概率 index=[]; for i=1:popsize %转popsize次轮盘 pick=rand; while pick==0 pick=rand; end for j=1:popsize %寻找本次生成的随机数<累积选择概率的染色体 pick=pick-pfit(j); if pick<0 index=[index j];%index和j的交集 break; end end end newpop=pop(index,:); end

以下是将给定代码转换为 Python 的结果:

import numpy as np

def zselect(pop, popsize, fitness):
    sumfit = np.sum(fitness)
    pfit = fitness / sumfit    # 每个个体的选择概率
    pfit = np.cumsum(pfit)    # 累积概率
    index = []
    for i in range(popsize):
        pick = np.random.rand()    # 生成随机数
        while pick == 0:
            pick = np.random.rand()
        for j in range(popsize):
            if pick < pfit[j]:    # 寻找随机数小于累积选择概率的染色体
                index.append(j)    # index和j的交集
                break
        newpop = pop[index, :]
    return newpop

但是需要注意的是，由于代码中没有提供 pop、popsize 和 fitness 的值，因此无法确定该代码是否能够正常运行。

相关问题

pop为100×36的矩阵，npop数值是100；function newPop = crossover(pop, nPop, pCross) newPop = pop; for i = 1:2:nPop if rand < pCross i1 = randi(nPop); i2 = randi(nPop); c = randi(size(pop,2)-1)+1; newPop(i,:) = [pop(i1,1:c), pop(i2,c:end)]; newPop(i+1,:) = [pop(i2,1:c), pop(i1,c:end)]; end end end这个代码哪里错了，怎么修改

这个代码有几个错误：

1. 在定义变量 `c` 时，`1` 应该是 `+`，表示将 c 后面的部分连接在 i1 的前面，即 `c+1`。

2. 在交叉时，应该是 `i+1` 而非 `i 1`，即将第二个子代索引改为 `i+1`。

下面是修改后的代码：

function newPop = crossover(pop, nPop, pCross)
    newPop = pop;
    for i = 1:2:nPop
        if rand < pCross
            i1 = randi(nPop);
            i2 = randi(nPop);
            c = randi(size(pop,2)-1) + 1;
            newPop(i,:) = [pop(i1,1:c), pop(i2,c:end)];
            newPop(i+1,:) = [pop(i2,1:c), pop(i1,c:end)];
        end
    end
end

将以下代码转换为python：function newpop=zmutate(pop,popsize,pm1,pm2,fitness1,M,N,Tn0,Tn1,Q,ST0,maxT,t,maxgen,LCR,ECR,MCR,FC,ICR) %M为辅助坑道数量；N为单元数 x=pop(:,1:2*M+1);%分段点位置 y=pop(:,2*M+2:4*M+2);%是否选择该分段点 z=pop(:,4*M+3:6*M+4);%开挖方向 W=pop(:,6*M+5:8*M+6);%作业班次 lenx=length(x(1,:)); leny=length(y(1,:)); lenz=length(z(1,:)); lenW=length(W(1,:)); avefit=sum(fitness1)/popsize; worstfit=min(fitness1); % sumy=sum(y); % lenz=sumy+1; % lenW=sumy+1; for i=1:popsize %选择popsize次，每次选择一个，输出一个 %随机选择一个染色体 pick=rand; while pick==0 pick=rand; end index=ceil(pick*popsize); f1=fitness1(index); if f1<=avefit % pm=(exp(-t/maxgen))*(pm1-(pm1-pm2)*(f1-avefit)/max(fitness1)-avefit); pm=1/(1+exp(t/maxgen))*(pm1-(pm1-pm2)*(f1-avefit)/max(fitness1)-avefit); else % pm=(exp(-t/maxgen))*pm1; pm=1/(1+exp(t/maxgen))*pm1; end pick=rand; while pick==0 pick=rand; end if pick>pm continue; end % flag0=0; % while(flag0==0) %随机选择变异位置 pick1=rand; pick2=rand; pick3=rand; pick4=rand; while pick1*pick2*pick3*pick4==0 pick1=rand; pick2=rand; pick3=rand; pick4=rand; end posx=ceil(pick1*lenx); posy=ceil(pick2*leny); %x,y变异 randx=randi([1,N-1]); while ismember(randx,x(index,:)) randx=randi([1,N-1]); end b=x(index,posx); x(index,posx)=randx; a=[0 1]; c=y(index,posy); y(index,posy)=setxor(y(index,posy),a); %z,W变异 posz=ceil(pick3*lenz); posW=ceil(pick4*lenW); d=z(index,posz); z(index,posz)=setxor(z(index,posz),a); randW=randi([1,3]); while randW==W(index,posW) randW=randi([1,3]); end e=W(index,posW); W(index,posW)=randW; mpop=[x(index,:),y(index,:),z(index,:),W(index,:)]; mtime=ztime(mpop,M,N,Tn0,Tn1,Q,ST0); mutfit=zcost(mpop,M,N,mtime(:,1),mtime(:,2:2*M+3),mtime(:,2*M+4:2*M+2+N),LCR,ECR,MCR,FC,ICR,Q); if mtime(:,1)>maxT||mutfit<=worstfit x(index,posx)=b; y(index,posy)=c; z(index,posz)=d; W(index,posW)=e; end end newpop=[x,y,z,W]; end

以下是Python代码：

import numpy as np

def zmutate(pop, popsize, pm1, pm2, fitness1, M, N, Tn0, Tn1, Q, ST0, maxT, t, maxgen, LCR, ECR, MCR, FC, ICR):
    # M为辅助坑道数量；N为单元数
    x = pop[:, :2*M+1] # 分段点位置
    y = pop[:, 2*M+2:4*M+2] # 是否选择该分段点
    z = pop[:, 4*M+3:6*M+4] # 开挖方向
    W = pop[:, 6*M+5:8*M+6] # 作业班次

    lenx = x.shape[1]
    leny = y.shape[1]
    lenz = z.shape[1]
    lenW = W.shape[1]

    avefit = np.sum(fitness1) / popsize
    worstfit = np.min(fitness1)

    newpop = np.zeros(pop.shape)

    for i in range(popsize):
        # 随机选择一个染色体
        pick = np.random.rand()
        while pick == 0:
            pick = np.random.rand()
        index = int(np.ceil(pick * popsize))
        f1 = fitness1[index]

        if f1 <= avefit:
            pm = (np.exp(-t / maxgen)) * (pm1 - (pm1 - pm2) * (f1 - avefit) / np.max(fitness1) - avefit)
            pm = 1 / (1 + np.exp(t / maxgen)) * (pm1 - (pm1 - pm2) * (f1 - avefit) / np.max(fitness1) - avefit)
        else:
            pm = (np.exp(-t / maxgen)) * pm1
            pm = 1 / (1 + np.exp(t / maxgen)) * pm1

        pick = np.random.rand()
        while pick == 0:
            pick = np.random.rand()

        if pick > pm:
            newpop[i, :] = pop[index, :]
            continue

        # 随机选择变异位置
        pick1 = np.random.rand()
        pick2 = np.random.rand()
        pick3 = np.random.rand()
        pick4 = np.random.rand()

        while pick1 * pick2 * pick3 * pick4 == 0:
            pick1 = np.random.rand()
            pick2 = np.random.rand()
            pick3 = np.random.rand()
            pick4 = np.random.rand()

        posx = int(np.ceil(pick1 * lenx))
        posy = int(np.ceil(pick2 * leny))

        # x,y变异
        randx = np.random.randint(1, N)
        while randx in x[index, :]:
            randx = np.random.randint(1, N)

        b = x[index, posx]
        x[index, posx] = randx

        c = y[index, posy]
        y[index, posy] = np.setxor1d(y[index, posy], [0, 1])

        # z,W变异
        posz = int(np.ceil(pick3 * lenz))
        posW = int(np.ceil(pick4 * lenW))

        d = z[index, posz]
        z[index, posz] = np.setxor1d(z[index, posz], [0, 1])

        randW = np.random.randint(1, 4)
        while randW == W[index, posW]:
            randW = np.random.randint(1, 4)

        e = W[index, posW]
        W[index, posW] = randW

        mpop = np.concatenate((x[index, :], y[index, :], z[index, :], W[index, :]))
        mtime = ztime(mpop, M, N, Tn0, Tn1, Q, ST0)
        mutfit = zcost(mpop, M, N, mtime[:, 0], mtime[:, 1:2*M+3], mtime[:, 2*M+4:2*M+2+N], LCR, ECR, MCR, FC, ICR, Q)

        if mtime[:, 0] > maxT or mutfit <= worstfit:
            x[index, posx] = b
            y[index, posy] = c
            z[index, posz] = d
            W[index, posW] = e

        newpop[i, :] = np.concatenate((x[index, :], y[index, :], z[index, :], W[index, :]))

    return newpop

注意，Python的数组下标是从0开始的，而MATLAB是从1开始的。此外，Python中的setxor函数的用法与MATLAB有些不同，需要将第二个参数改为一个数组。