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[n]; int lenIn = dataIn.Length; double[] a = new double[lenIn]; double[] divIn = new double[lenIn]; double[] divOut = new double[n]; 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; }