LINQ将列交换为行 [英] LINQ swap columns into rows

问题描述

是否有一个奇特的LINQ表达式，可以使我以更简单的方式执行以下操作.我有一个List<List<double>>，假设列表是二维矩阵中的列，我想将列列表交换为行列表.我有以下明显的解决方案:

Is there a fancy LINQ expression that could allow me to do the following in a much more simpler fashion. I have a List<List<double>>, assuming the List are columns in a 2d matrix, I want to swap the list of columns into a list of rows. I have the following obvious solution:

int columns = 5;
var values; // assume initialised as List<List<double>>()

var listOfRows = new List<List<double>>();
for (int i = 0; i < columns ; i++)
{
    List<double> newRow = new List<double>();
    foreach (List<double> value in values)
    {
        newRow.Add(value[i]);
    }
    listOfRows.Add(newRow);
}

推荐答案

您可以非常轻松地LINQify内部循环:

You could LINQify the inner loop pretty easily:

vector.AddRange(values.Select(value => value[i]));

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