在Matlab中使用i和j作为变量 [英] Using i and j as variables in Matlab

问题描述

i和j是非常流行的变量名称(请参见例如这个).

i and j are very popular variable names (see e.g., this question and this one).

例如，在循环中:

for i=1:10,
    % do something...
end

作为矩阵的索引:

mat( i, j ) = 4;

为什么不应该在Matlab中将它们用作变量名?

Why shouldn't they be used as variable names in Matlab?

推荐答案

因为i和j都是表示的函数虚构单位 :

Because i and j are both functions denoting the imaginary unit:

• http://www.mathworks.co.uk/help/matlab/ref/i .html
• http://www.mathworks.co.uk/help/matlab/ref/j .html

• http://www.mathworks.co.uk/help/matlab/ref/i.html
• http://www.mathworks.co.uk/help/matlab/ref/j.html

因此，名为i或j的变量将覆盖它们，可能会悄无声息地破坏执行复杂数学运算的代码.

So a variable called i or j will override them, potentially silently breaking code that does complex maths.

可能的解决方案包括改为使用ii和jj作为循环变量，或者在需要i代表虚部时使用1i.

Possible solutions include using ii and jj as loop variables instead, or using 1i whenever i is required to represent the imaginary unit.

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