如果满足条件，则在当前迭代步骤结束时退出循环 [英] Exit loop at the end of current iteration step if condition is fulfilled

问题描述

我有一个常见的问题如下：

在一个循环中（通常是一个for循环），一些约束是 - 必须请在开始时检查 。现在有时如果条件满足，循环内的代码应该运行到当前迭代步骤的结尾，然后退出。

通常我会这样做，不管怎样，这样的

  a = 0; 
 quit = 0; 
 
对于i = 1：1：11 
 if（a == 5）％要检查的条件*计算之前
 quit = 1; ％迭代后的停止循环
结束
 
 a = a + 1; ％计算
 ... 
 
 if（quit == 1）
 break; 
 end 
 end 
  

但是， code> if（quit == 1）可能会导致相关的减速。还有一个需要引入额外的变量，所以我不知道这是如何通常这样做，或者如果有更好的方式来做到这一点...

解决方案

那么：

  for i = 1:11 
 quit =（a == 5）; ％要检查的条件*计算前
 a = a + 1 
如果退出
 break; ％迭代后的停止循环
 end 
 end 
  

有什么区别？ / p>

A common problem I have is the following:

Within a loop (usually a for loop) some constraints are - and have to be - checked at the beginning. Now sometimes if a condition if fulfilled, the code within the loop should run to the end of the current iteration step and then quit.

Usually I'd do it somehow like so

a = 0;
quit = 0;

for i = 1:1:11
  if (a == 5)    % Condition to be checked *before* the calculation
    quit = 1;    % Stop loop after this iteration
  end

  a = a + 1;     % Calculation
  ...

  if (quit == 1)
    break;
  end
end

But in a tight loop already this extra condition checking if (quit == 1) might give a relevant slow down. Also one needs to introduce an extra variable so I wonder how this is usually done or if there is a better way to do it...

解决方案

What about:

for i = 1:11
    quit = (a==5); % Condition to be checked *before* the calculation
    a = a+1
    if quit
        break;     % Stop loop after this iteration
    end
end

Makes any difference?

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