给定n 个物品, 物品i重为wi 并且价值为 vi ,背包所能承载的最大容量为 W.
0-1 背包问题即是选择含有着最大总价值的物品的子集且它的容量 ≤W .
用动态规划实现-given n goods, items i weight of wi and value of vi, the backpack can carry a maximum capacity of W. 0-1 knapsack problem that is a choice with a maximum total value of the goods but a subset of the W capacity. Dynamic Programming
双曲线回归方程 HyperbolaRegress.cs
注意!该模型要求a与b的值要大于0!使用该模型时应注意验证这个限制条件。我在实现模型时未加入任何出错流程控制。X不能为0。
方程模型为
public override double[] buildFormula()
得到系数数组,存放顺序与模型系数相反,即该数组中系数的值依次是b,a。
public override double forecast(double x)
预测函数,根据模型得到预测结果。
public override double computeR2()
-Hyperbola regression equation HyperbolaRegress.cs attention! The model demands a and b value is greater than 0! Caution should be taken when using the model verify the conditions of this restriction. I realize the model error is not to join any flow control. X should not to 0. Equation model for public override double [] buildFormula () get coefficient array, the storage order and model coefficients contrary, that is, the array is followed by the value of coefficient b, a. public override double forecast (double x) prediction function, according to the results of model prediction. public override double computeR2 ()
的傅立叶变换,工程技术中,常将看成一时间信号,相应的空间,称为时间域和空域;将其傅立叶变换看成频率函数,相应的空间称为频域。称为其相角,这在物理上是有良好背景的。-The Fourier transform, engineering technology, often viewed as a time signal, the corresponding space, known as time domain and airspace its Fourier transform as a frequency function, the corresponding space is called the frequency domain. Known as its phase angle, which in physics is a good background.