MATLAB - 巢狀迴圈

MATLAB允許在一個迴圈內巢狀另一個迴圈。以下部分顯示了一些示例來說明這個概念。

語法

MATLAB中巢狀for迴圈語句的語法如下：

for m = 1:j
   for n = 1:k
      <statements>;
   end
end

MATLAB中巢狀while迴圈語句的語法如下：

while <expression1>
   while <expression2>
      <statements>
   end
end

示例

讓我們使用巢狀for迴圈來顯示1到100之間所有素數。建立一個指令碼檔案並鍵入以下程式碼：

for i = 2:100
   for j = 2:100
      if(~mod(i,j)) 
         break; % if factor found, not prime
      end 
   end
   if(j > (i/j))
      fprintf('%d is prime\n', i);
   end
end

執行檔案後，它將顯示以下結果：

2 is prime
3 is prime
5 is prime
7 is prime
11 is prime
13 is prime
17 is prime
19 is prime
23 is prime
29 is prime
31 is prime
37 is prime
41 is prime
43 is prime
47 is prime
53 is prime
59 is prime
61 is prime
67 is prime
71 is prime
73 is prime
79 is prime
83 is prime
89 is prime
97 is prime