循环内循环索引变量的变化 [英] Change for loop index variable inside the loop
问题描述
我需要在迭代中更改我的循环变量,因为我必须访问循环中的数组元素,它正在改变循环中的w.r.t大小。
这是我的代码片段:
que = [];
que = [2,3,4];
全局len;
len = size(que,2)
x = 4;
for i = 1:len
如果x <= 10
que(x)= 5;
len = size(que,2)
x = x + 1;
end
end
que
数组应该打印如下:
2 3 4 5 5 5 5 5 5 5
pre>
但是打印如下:
2 3 4 5 5 5
在Visual C ++中,正确计算了数组,并打印了整个10个元素的数组,在运行时增加。
如何在Matlab中完成这个?
解决方案que = [2 3 4];
x = 4;
而x< = 10
que(x)= 5;
x = x + 1;
end
或者,您可以避免使用循环(以下列方式之一对您的代码进行向量化: p>
que = [2 3 4]; %#你的初始向量
%#选项#1:
que = [que 5. * ones(1,7)]; %#在Que
%#选项#2:
que(4:10)= 5的末尾附加七个fives; %#使用索引扩展que
I need to change my loop variable inside the iteration as I have to access array elements in the loop which is changing w.r.t size inside the loop.
Here is my code snippet:
que=[]; que=[2,3,4]; global len; len=size(que,2) x=4; for i=1:len if x<=10 que(x)= 5; len=size(que,2) x=x+1; end end que
Array should print like:
2 3 4 5 5 5 5 5 5 5
But it is printed like this:
2 3 4 5 5 5
In Visual C++ the array is calculated correctly and whole array of 10 elements is printed, which increases at run time.
How can I accomplish this in Matlab?
解决方案You should use a while loop instead of a for loop to do this:
que = [2 3 4]; x = 4; while x <= 10 que(x) = 5; x = x+1; end
Or, you can avoid using loops altogether by vectorizing your code in one of the following ways:
que = [2 3 4]; %# Your initial vector %# Option #1: que = [que 5.*ones(1,7)]; %# Append seven fives to the end of que %# Option #2: que(4:10) = 5; %# Expand que using indexing
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