我必须使用一个接受double [,]的方法,但我只有一个double []。我该如何转换它?
到目前为止的解决方案:
var array = new double[1, x.Length];
foreach (var i in Enumerable.Range(0, x.Length))
{
array[0, i] = x;
}
答案 0 :(得分:8)
没有直接的方法。您应该将内容复制到double[,]
。假设你想要它在一行:
double[,] arr = new double[1, original.Length];
for (int i = 0; i < original.Length; ++i)
arr[0, i] = original[i];
答案 1 :(得分:6)
如果您知道2D数组的宽度,可以使用以下内容将值一个接一个地放在另一行中。
private T[,] toRectangular<T>(T[] flatArray, int width)
{
int height = (int)Math.Ceiling(flatArray.Length / (double)width);
T[,] result = new T[height, width];
int rowIndex, colIndex;
for (int index = 0; index < flatArray.Length; index++)
{
rowIndex = index / width;
colIndex = index % width;
result[rowIndex, colIndex] = flatArray[index];
}
return result;
}
答案 2 :(得分:2)
我刚刚编写了这段代码,我将使用:
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
namespace MiscellaneousUtilities
{
public static class Enumerable
{
public static T[,] ToRow<T>(this IEnumerable<T> target)
{
var array = target.ToArray();
var output = new T[1, array.Length];
foreach (var i in System.Linq.Enumerable.Range(0, array.Length))
{
output[0, i] = array[i];
}
return output;
}
public static T[,] ToColumn<T>(this IEnumerable<T> target)
{
var array = target.ToArray();
var output = new T[array.Length, 1];
foreach (var i in System.Linq.Enumerable.Range(0, array.Length))
{
output[i, 0] = array[i];
}
return output;
}
}
}
答案 3 :(得分:0)
Mehrdad假设宽度为1,因为没有真正的方法来确定一维数组本身的宽度或高度。如果你有'宽度'的某些(外部)概念,那么Mehrdad的代码变为:
// assuming you have a variable with the 'width', pulled out of a rabbit's hat
int height = original.Length / width;
double[,] arr = new double[width, height];
int x = 0;
int y = 0;
for (int i = 0; i < original.Length; ++i)
{
arr[x, y] = original[i];
x++;
if (x == width)
{
x = 0;
y++;
}
}
虽然 Row major 在许多应用程序(矩阵,文本缓冲区或图形)中可能更常见:
// assuming you have a variable with the 'width', pulled out of a rabbit's hat
int height = original.Length / width;
double[,] arr = new double[height, width]; // note the swap
int x = 0;
int y = 0;
for (int i = 0; i < original.Length; ++i)
{
arr[y, x] = original[i]; // note the swap
x++;
if (x == width)
{
x = 0;
y++;
}
}