分段线性插值 C#代码

/// <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;
}