曲线拟合（多阶多项式拟合） java实现 1阶2项式的拟合

 java实现 1阶2项式的拟合

ic class TestPoly {
/* 离散的实验样本观察数据，进行一阶二项式函数的拟合测试 auth：tlc */
public static void main(String[] args) {
/** 1阶2项式的拟合 */
PolynomialCurveFitter polynomialCurveFitter = PolynomialCurveFitter.create(1);/** 一阶 */
ArrayList weightedObservedPoints = new ArrayList();
/* 样本数据集合 157*157 */

double[] x = { 19, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 25, 25,
25, 25, 25, 25, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 28, 28, 28, 28, 28, 29, 29, 29, 29, 30,
30, 30, 30, 30, 30, 31, 31, 31, 31, 31, 32, 32, 32, 32, 32, 32, 33, 33, 33, 33, 33, 34, 34, 34, 34, 34,
35, 35, 35, 35, 35, 35, 36, 36, 36, 36, 36, 37, 37, 37, 37, 37, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39,
40, 40, 40, 40, 40, 41, 41, 41, 41, 41, 42, 42, 42, 42, 42, 43, 43, 43, 43, 43, 43, 44, 44, 44, 44, 44,
44, 45, 45, 45, 45, 45, 46, 46, 46, 46, 46, 47, 47, 47, 48, 48, 48, 49, 49, 49, 49, 49, 50, 50, 50, 50,
50, 50, 50 };
double[] y = { 1, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 2, 3, 4, 5, 2, 3, 4, 5, 6, 7, 4, 5, 6, 7, 8, 9, 5, 6, 7, 8,
9, 6, 7, 8, 9, 10, 11, 12, 7, 8, 9, 10, 11, 10, 11, 12, 13, 10, 11, 12, 13, 14, 15, 11, 12, 13, 14, 16,
12, 13, 14, 15, 17, 18, 14, 15, 16, 17, 18, 16, 17, 18, 19, 20, 17, 18, 19, 20, 21, 22, 18, 20, 21, 22,
23, 19, 20, 21, 22, 23, 20, 21, 22, 23, 24, 25, 22, 23, 24, 27, 23, 24, 25, 26, 27, 24, 25, 26, 27, 28,
25, 28, 29, 30, 31, 26, 28, 29, 30, 31, 32, 28, 29, 30, 31, 32, 33, 30, 31, 32, 33, 35, 30, 31, 32, 34,
36, 32, 33, 37, 34, 35, 38, 34, 36, 37, 38, 39, 35, 36, 37, 38, 39, 40, 41

};
for (int z = 0; z < 157; z++) {
WeightedObservedPoint weightedObservedPoint = new WeightedObservedPoint(1, x[z], y[z]);
weightedObservedPoints.add(weightedObservedPoint);
}

double[] r = polynomialCurveFitter.fit(weightedObservedPoints);
System.out.println(r[0]);
System.out.println(r[1]);
/** 结论 验证 :利用matlab 在笛卡尔坐标系上画出离散的样本数据，勾画出函数图形，离散数据基本拟合为此函数 */
/*
* b= -25.214711365727233 a= 1.2627992160616124
*/

}