这是一个适用于矩形(非破碎)矩阵的工具。这里的C#代码可以剪切并粘贴到LinqPad,一个免费的,交互式的C#编程工具。
我定义了一个后缀运算符(即扩展方法)“Transpose”。使用操作如下:造成这样的事情
var rand = new Random();
var xss = new [] {
new [] {rand.NextDouble(), rand.NextDouble()},
new [] {rand.NextDouble(), rand.NextDouble()},
new [] {rand.NextDouble(), rand.NextDouble()},
};
xss.Dump("Original");
xss.Transpose().Dump("Transpose");
:
Original
0.843094345109116
0.981432441613373
0.649207864724662
0.00594645645746331
0.378864820291691
0.336915332515219
Transpose
0.843094345109116
0.649207864724662
0.378864820291691
0.981432441613373
0.00594645645746331
0.336915332515219
该运营商实施的要点是以下
public static IEnumerable<IEnumerable<T>> Transpose<T>(this IEnumerable<IEnumerable<T>> xss)
{
var heads = xss.Heads();
var tails = xss.Tails();
var empt = new List<IEnumerable<T>>();
if (heads.IsEmpty())
return empt;
empt.Add(heads);
return empt.Concat(tails.Transpose());
}
这是全面落实,有些线条评论说你可以取消注释来监视函数的工作方式。
void Main()
{
var rand = new Random();
var xss = new [] {
new [] {rand.NextDouble(), rand.NextDouble()},
new [] {rand.NextDouble(), rand.NextDouble()},
new [] {rand.NextDouble(), rand.NextDouble()},
};
xss.Dump("Original");
xss.Transpose().Dump("Transpose");
}
public static class Extensions
{
public static IEnumerable<T> Heads<T>(this IEnumerable<IEnumerable<T>> xss)
{
Debug.Assert(xss != null);
if (xss.Any(xs => xs.IsEmpty()))
return new List<T>();
return xss.Select(xs => xs.First());
}
public static bool IsEmpty<T>(this IEnumerable<T> xs)
{
return xs.Count() == 0;
}
public static IEnumerable<IEnumerable<T>> Tails<T>(this IEnumerable<IEnumerable<T>> xss)
{
return xss.Select(xs => xs.Skip(1));
}
public static IEnumerable<IEnumerable<T>> Transpose<T>(this IEnumerable<IEnumerable<T>> xss)
{
// xss.Dump("xss in Transpose");
var heads = xss.Heads()
// .Dump("heads in Transpose")
;
var tails = xss.Tails()
// .Dump("tails in Transpose")
;
var empt = new List<IEnumerable<T>>();
if (heads.IsEmpty())
return empt;
empt.Add(heads);
return empt.Concat(tails.Transpose())
// .Dump("empt")
;
}
}
@DBM:什么是定义AddRange的? –
@ Reb.Cabin:http://msdn.microsoft.com/en-us/library/z883w3dc.aspx –