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a
说明： 决策树(Decision Tree）是在已知各种情况发生概率的基础上，通过构成决策树来求取净现值的期望值大于等于零的概率，评价项目风险，判断其可行性的决策分析方法，是直观运用概率分析的一种图解法。由于这种决策分支画成图形很像一棵树的枝干，故称决策树。在机器学习中，决策树是一个预测模型，他代表的是对象属性与对象值之间的一种映射关系。Entropy = 系统的凌乱程度，使用算法ID3, C4.5和C5.0生成树算法使用熵。这一度量是基于信息学理论中熵的概念。
决策树是一种树形结构，其中每个内部节点表示一个属性上的测试，每个分支代表一个测试输出，每个叶节点代表一种类别。
分类树（决策树）是一种十分常用的分类方法。它是一种监督学习，所谓监督学习就是给定一堆样本，每个样本都有一组属性和一个类别，这些类别是事先确定的，那么通过学习得到一个分类器，这个分类器能够对新出现的对象给出正确的分类。这样的机器学习就被称之为监督学习。(Decision tree is a decision analysis method based on the known probability of occurrence of various situations, which can calculate the probability that the expected value of net present value is greater than or equal to zero, evaluate the project risk and judge its feasibility by constructing a decision tree. It is a graphic method of intuitively using probability analysis. Because this kind of decision branch is drawn as a graph, it is very similar to the branch of a tree, so it is called decision tree. In machine learning, decision tree is a prediction model, which represents a mapping relationship between object attributes and object values. Entropy = the disorder degree of the system, using algorithms ID3, C4.5 and C5.0, spanning tree algorithm using entropy. This measure is based on the concept of entropy in information theory.)
- 2021-02-01 15:02:09下载
- 积分：1
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Using-Advanced-Signal-Processing-Techniques-on-Am
Using Advanced Signal Processing Techniques on Ambient Vibration Records of a Structure
- 2013-11-07 16:51:55下载
- 积分：1
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chua
分析蔡氏电路的相轨迹图,画出了各个变量的三维、二维相图
(Chua' s circuit analysis phase trajectory diagram depicts the various variables dimensional, two-dimensional phase diagram)
- 2013-11-15 11:23:44下载
- 积分：1
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erweishuju
练习二维数组编程的绝佳资料，适合初学者快速入门。(Two-dimensional array of programming exercises great information for beginners Quick Start.)
- 2016-02-17 13:11:33下载
- 积分：1
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jf_Box_Muller_transform
Box-Muller变换，将[0,1]均匀分布转换为[0,1]高斯正态分布，在matlab中也可用randn函数生成正态分布。变换的思想可用于其他没有正态分布随机函数的编程语言（如C）()
- 2007-09-27 17:02:09下载
- 积分：1
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MieCoated
用Mie理论计算双层粒子的散射角——散射光强曲线
1．RB1.m 计算第一类Ricatti-Bessel函数的函数
2．RB2.m 计算第二类Ricatti-Bessel函数的函数
3. Alegendr.m 计算角函数 和 的函数
4. MieCoeff.m 计算包覆粒子米尔系数的函数
5. Amp.m 计算散射光复振幅的函数
6. MieIntensity.m 画包覆粒子散射角-光强图
(Mie theory calculations using double-particle scattering angle- scattering intensity curve 1. RB1.m calculate the first class Ricatti-Bessel function of the function 2. RB2.m calculate the second category Ricatti-Bessel function of the function 3. Alegendr.m computing angle functions and function 4. MieCoeff.m coated particles Mill coefficient calculation function 5. Amp.m calculate the scattering amplitude recovery function 6. MieIntensity.m painting coated particle scattering angle- light intensity diagram)
- 2013-10-05 14:40:22下载
- 积分：1
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mRMR_0.9_compiled
mRMR_0.9_compiled---This is a cross-platform version of mimimum-redundancy maximum-relevancy feature selection
- 2013-03-20 00:53:12下载
- 积分：1
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orbital-dynamics-modeling-
地球和月球二轨道动力学建模和仿真，完整的参数输入仿真结果(moon and the Earth s orbital dynamics modeling )
- 2020-08-30 20:58:10下载
- 积分：1
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SVM-2D-Classification-
SVM 2D Classification
Comparing Gaussian and polynomial Kernels (SVM 2D Classification Comparing Gaussian and polynomial Kernels)
- 2011-09-27 17:38:05下载
- 积分：1
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zhuyaunfenxi_C
主元分析法的C语言程序，主要用在降维的方面，也可用在信号处理，故障诊断。(Principal Component Analysis Method C language program, mainly used in dimensionality reduction, can also be used in signal processing, fault diagnosis.)
- 2013-04-14 09:50:54下载
- 积分：1
