C# 分段线性插值函数

由于项目需要，需要将数据采集得到的点数转化为固定点数，使用分段线性插值其实现代码如下：

/// <summary>

/// 分段线性插值，将一组数插值为所需点数

/// </summary>

/// <param name="dataIn">待插值的数据数组</param>

/// <param name="n">插值点数</param>

/// <returns>插值后的数据数组</returns>

public static double[] Interpolation(double[] dataIn,int n)

{

double[] dataOut = new double
;

int lenIn = dataIn.Length;

double[] a = new double[lenIn];

double[] divIn = new double[lenIn];

double[] divOut = new double
;

divIn[0] = 0;

for (int i = 1; i < lenIn; i++)

{

divIn[i] = divIn[i - 1] + 1;

}

divOut[0] = 0;

for (int i = 1; i < n; i++)

{

divOut[i] = divOut[i - 1] + lenIn / Convert.ToDouble(n);

}

int k = 0;

for (int i = k; i < n; i++)

{

for (int j = 0; j < lenIn - 1; j++)

{

if (divOut[i] >= divIn[j] && divOut[i] < divIn[j + 1])

{

dataOut[i] = (dataIn[j + 1] - dataIn[j]) * (divOut[i] - divIn[j]) / (divIn[j + 1] - divIn[j]) + dataIn[j];

k = i;

}

}

}

return dataOut;

}