如何在 C# 中使用 3 个数组分配变量

Question

我正在尝试为有限元地质学软件编写插件。

我有三个数组，它们本质上是一个坐标系。我想根据变量在网格系统中的位置为它赋值。基本上我想说如果我的节点在一个x范围和一个y范围内，那么我在这个节点的含水层厚度就是这个值。到目前为止我有这个。

//create an array of xcoords of data points:
double[] xcoord = new double[11] {0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50};

//create an array of ycoords of data points:
double[] ycoord = new double[11] {0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50};

//create an array of aquifer thickness

double[] aquiferThicknessPoints = new double[121]
        {
        10, 10, 12, 13, 12, 15, 14, 15, 14, 13, 13,
        10, 10, 13, 15, 16, 14, 13, 15, 16, 12, 13,
        12, 14, 15, 18, 19, 17, 14, 15, 18, 14, 14,
        13, 14, 15, 18, 20, 17, 15, 17, 18, 15, 15,
        14, 15, 17, 18, 21, 17, 18, 18, 19, 17, 16,
        15, 15, 17, 17, 20, 21, 21, 19, 19, 18, 18,
        15, 15, 17, 20, 20, 21, 22, 21, 19, 19, 19,
        16, 17, 19, 20, 22, 23, 22, 21, 20, 20, 20,
        17, 18, 20, 22, 23, 24, 24, 23, 22, 20, 21,
        18, 19, 21, 22, 24, 25, 24, 23, 22, 22, 22,
        19, 19, 22, 22, 24, 25, 25, 23, 23, 22, 23,
        }; 

dataPointSpacingHalf = dataPointSpacing / 2;



for (int i = 0; i < xcoord.Length; i++)
{
    for (int j = 0; j < ycoord.Length; j++)
    {
        if (nodeX >= (xcoord[i] - dataPointSpacingHalf) && (nodeX < (xcoord[i] + dataPointSpacingHalf)) && (nodeY >= (ycoord[j] - dataPointSpacingHalf) && (nodeY < (ycoord[j] + dataPointSpacingHalf))))
        {
            aquiferThickness = aquiferThicknessPoints[?];
        }
    }
}

我可以看到嵌套的 for 循环将如何循环 110 次，但我不知道如何将阵列中的含水层厚度分配给每个循环。

我对解决这个问题的任何方法都持开放态度，因为我是编程的新手，但我仍然不确定哪种方法是实现目标的最佳方法。

Answer 1

您想为您的 aquiferThicknessPoints 使用二维数组：

double[,] aquiferThicknessPoints = new double[,]
{
  {10, 10, 12, 13, 12, 15, 14, 15, 14, 13, 13},
  {10, 10, 13, 15, 16, 14, 13, 15, 16, 12, 13},
  {12, 14, 15, 18, 19, 17, 14, 15, 18, 14, 14},
  {13, 14, 15, 18, 20, 17, 15, 17, 18, 15, 15},
  // the rest
};

然后您可以使用两个坐标寻址数据：

aquiferThickness = aquiferThicknessPoints[j, i];

（或i, j，您的数据是如何组织的并不明显）

Answer 2

只需使用 i * xcoord.Length + j 而不是 ?

代码如下：

for (int i = 0; i < xcoord.Length; i++)
{
    for (int j = 0; j < ycoord.Length; j++)
    {
                                                      //Here is the magic!
        //without considering coordinates
        //aquiferThickness[i, j] = aquiferThicknessPoints[i * xcoord.Length + j];

        //considering coordinates
        aquiferThickness[i, j] = 
            aquiferThicknessPoints[
                CoordToIndex(xNode,indexedCoords) * xcoord.Length + 
                CoordToIndex(yNode,indexedCoords)];

    }
}

还要考虑xNode，Node坐标，可以采用这种方式

Dictionary<int, double> indexedCoords = new Dictionary<int, double> { { 0, 0 }, { 1, 5 }, { 2, 10 }, .... };

int CoordToIndex(double node, Dictionary<int, double> indexedCoords)
{
    return indexedCoords.First(i => i.Value > node).Key;
}

如何在 C# 中使用 3 个数组分配变量

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