概率事件的期望计算（抽卡、装备、人偶、点火石等）
按照期望抽数计算，超过期望抽数为非洲人，低于期望抽数为欧洲人
1.抽卡
有老哥问，为什么抽6个角色不是100*6，而是500，这边用10万人，采用模拟抽取的方式来计算抽数结果如下
抽六个当期天子，大多数人在426抽完成抽取：
抽七个当期天子，大多数人在542抽完成抽取：
matlab代码
clear;clc;
nn=100000; %renshu
mm=5000; %choukashi
ex1=zeros(nn,1); %shuzu
number=0; %jishu
siren1=0;
siren2=0;
siren3=0;
siren4=0;
siren5=0;
siren6=0;
siren7=0;
choukacishu=0;
chouzhong = 0;
douchoudao = 0;
for n=1:length(ex1)
choukacishu=0;
if choukacishu < mm
for m=choukacishu:mm
rate = rand();
choukacishu=choukacishu+1;
if rate <=0.01
siren1=siren1+1;
chouzhong =1;
end
if chouzhong ==1
break
end
end
end
chouzhong =0;
if choukacishu < mm
for m2=choukacishu:mm
rate2=rand();
choukacishu=choukacishu+1;
if rate2 <= 0.01
siren2=siren2+1;
chouzhong =1;
end
if chouzhong ==1
break
end
end
end
chouzhong =0;
if choukacishu < mm
for m3=choukacishu:mm
rate3=rand();
choukacishu=choukacishu+1;
if rate3 <= 0.01
siren3=siren3+1;
chouzhong =1;
end
if chouzhong ==1
break
end
end
end
chouzhong = 0;
if choukacishu < mm
for m4=choukacishu:mm
rate4=rand();
choukacishu=choukacishu+1;
if rate4 <= 0.01
siren4=siren4+1;
chouzhong =1;
end
if chouzhong ==1
douchoudao =1;
break
end
end
end
chouzhong=0;
if choukacishu < mm
for m5=choukacishu:mm
rate5=rand();
choukacishu=choukacishu+1;
if rate5 <= 0.01
siren5=siren5+1;
chouzhong =1;
end
if chouzhong ==1
douchoudao =1;
break
end
end
end
chouzhong=0;
if choukacishu < mm
for m6=choukacishu:mm
rate6=rand();
choukacishu=choukacishu+1;
if rate6 <= 0.01
siren6=siren6+1;
chouzhong =1;
end
if chouzhong ==1
douchoudao =1;
break
end
end
end
if choukacishu < mm
for m7=choukacishu:mm
rate7=rand();
choukacishu=choukacishu+1;
if rate7 <= 0.01
siren7=siren7+1;
chouzhong =1;
end
if chouzhong ==1
douchoudao =1;
break
end
end
end
chouzhong=0;
if choukacishu == mm
number = number+1;
end
if douchoudao ==1
ex1(n)=choukacishu;
douchoudao =0;
end
end
figure(1);
sum(ex1)/length(ex1)
ex1(ex1==0) = [];
ex2=tabulate(ex1);
subplot(1,2,1);
title('1%概率抽取6次模拟抽取')
xlabel("抽卡次数/抽")
ylabel("抽出发带人数")
plot(ex2(:,1),ex2(:,2))
2.点火石
其中，“有用的石头” 参考土星大佬百科全书的点火石挑选。
3.人偶
计算相关概率
4.装备
仅针对“国际服附魔指南一图流”中提到的附魔进行期望计算
