找到正確的代碼行來確定MATLAB中的分佈時遇到問題

Question

用幾行代碼來掙扎。

這是上下文： 考慮一下這樣一個實驗，在這個實驗中，一個公平的硬幣投擲1000次，讓X是連續三個頭的模式出現次數的 次數。注意 重疊是允許的，所以如果序列是HHHHTT··TT，那麼X = 2. 估計 X的概率質量函數並用它來估計X的均值和方差。 ）估計。

這是提供的模板，並突出顯示了我需要添加的5行代碼及其說明。

clear all 

N=1000; %Number of Die Rolls 
nreps=10000; 
count=zeros(1,N+1); %count will be a vector of size N+1 such that, for i=0...N, c(i+1)/nreps=P(X=i)  

for n=1:nreps 
    n_3H = 0; %count the number of occurrences of the pattern HHH 
     ***%Add code to toss a coin N times*** 
     for i=3:N 
     if ***%Add condition that the pattern HHH appears at position (i-2,i-1,i)*** 
      n_3H = n_3H+1; 
     end 
     end 
    ***%Add code to increment count(n_3H+1) by 1*** 
end 

RelFreq = count/nreps; 

meanX ***%Add code to estimate the mean of X*** 
varX ***%Add code to estimate the variance of X*** 

到目前爲止，這是我的，但它似乎沒有任何回報，我不確定我應該怎麼做才能繼續。

clear all 

N=1000; %Number of Die Rolls 
nreps=100; 
count=zeros(1,N+1);%count will be a vector of size N+1 such that, for i=0...N, c(i+1)/nreps=P(X=i)  

for n=1:nreps 
    n_3H = 0; %count the number of occurrences of the pattern HHH 
     flipStates = randi([1, 2], 1, N) %Add code to toss a coin N times 
     for i=3:N 
     if strfind(flipStates, [1,1,1])%Add condition that the pattern HHH appears at position (i-2,i-1,i) 
      n_3H = n_3H+1; 
     end 
     end 
     %Add code to increment count(n_3H+1) by 1 
end 

RelFreq = count/nreps; 

meanX %Add code to estimate the mean of X 
varX %Add code to estimate the variance of X 

任何幫助，將不勝感激！

Answer 1

，因爲在整個折騰順序循環，檢查各子序列單獨的，你應該做的：

if all(flipStates(i-2:i) == [1,1,1])

你做了什麼檢查哪個MATLAB翻譯爲if all(vector)矢量if條件。

你的做法是正確的，如果你把它拿出來（實際上不是）循環：for i=3:N ...做：n_3H = numel(strfind(flipStates,[1 1 1]))