两个数字列表之间的C#元素明智差异 [英] C# element-wise difference between two lists of numbers

问题描述

假设

List<int> diff(List<int> a, List<int> b)
{ 
    // assume same length lists
    List<int> diff= new List<int>(a.Count);
    for (int i=0; i<diff.Count; ++i)
    {
        diff[i] = a[i] - b[i];
    }
    return diff;
}

我希望某种形式的单行代码执行相同的操作，或者使用lambda进行某种操作，而不是重写所有样板代码.

I would like to have some kind of one-liner do the same, or something that uses a lambda, rather than re-writing all the boilerplate.

例如，在python中，可以是

for instance, in python, this would be either

[ai-bi for ai,bi in zip(a,b)]

甚至

np.array(a) - np.array(b)

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有没有很好的方法用C#编写此代码?我所有的搜索都找到了删除或添加列表元素的方法，但是没有关于元素操作的方法.

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Is there a nice way to write this in C#? All my searches find ways to remove or add list elements, but nothing about element-wise actions.

推荐答案

Linq具有

Linq has a Zip method as well:

var diff = a.Zip(b, (ai, bi) => ai - bi);

请注意，您代码中的一个潜在错误是，如果 b 的元素少于 a 的元素，那么当您尝试访问范围之外的元素时会出现异常的 b .只要两个收藏夹中都有商品， Zip 将只返回商品，这实际上是两个收藏夹长度中较短的一个.

Note that one potential bug in your code is if b has fewer elements than a then you'd get an exception when you try to access an element outside the range of b. Zip will only return items as long as both collections have items, which is effectively the shorter of the two collection lengths.

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