LDA_classification_algorithm

ParInfoGain - Computes parallel information gain and gain ratio in Matlab using the Matlab Parallel Computing Toolbox or the Distributed Server (if available) Information gain is defined as: InfoGain(Class,Attribute) = H(Class) - H(Class | Attribute) Gain ratio is defined as: GainRatio(Class, Attribute) = (H(Class) - H(Class | Attribute)) / H(Attribute). ...where H is the entropy, defined as - sum(i=1 to k) pi log2 pi

三次样条差值方法的说明,包括其推到过程。(Method of cubic spline description of the difference)

阵列信号处理中信源数目估计----盖而圆半径法(CITIC source array signal processing the estimated number of covered and Radii----)

宽带信号测向的几种直接处理算法法，主要用于宽带目标的DOA估计 (Broadband signal measurements to several processing algorithms law, mainly for broadband target DOA estimation)

研究表明超高斯分布更加贴近语音信号的实际分布，然而语音信号很难用单一的概率密度 函数准确描述，针对这一情况，提出了一种用超高斯混合模型对语音信号幅度谱建模的新方法，并推导了 基于此模型的幅度谱最小均方误差估的估计式。仿真结果表明：与传统的短时谱估计算法相比，该算法不 仅能够进一步提高增强语音的信噪比，而且可以有效减小增强语音的失真度，提高增强语音的主观感知 质量。 (Recent research indicates that the speech spectral amplitude distributions could be fairly described with super-Gaussian probability density function. However, the complexity of speech signal determines that the distribution statistics ofspeech signal could not be well described by single simple function. Thus a super-Gaussian mixture model for speech spectral amplitude is proposed, and with this model, a minimum mean-square error (MMSE) estimator for speech signals spectral amplitude is derived. The simulation results show that this algorithm based on Gaussian and super-Gaussian speech model could achieve better noise suppression and lower speech distortion as compared with the conventional short-time spectral amplitude estimation algorithm. )

Newton-Raphson算法 介绍 在科学计算和财经工程领域，许多数值算法都是通用的（至少在理论上是），可广泛地用于解决一类问题。一个大家熟悉的例子就是Newton-Raphson例程，它可用来寻找方程 f(x)=0的数值解。标准的数学表达式f(x)表示f是变量x的函数，其通常的表达形式为f(x,a,b,...)=0，f被定义为多于一个变量的函数。在这种情况下，Newton-Raphson算法试图把x以外的变量固定并作为参数，而寻找关于变量x的数值解。 由于Newton-Raphson算法需要知道被求解函数的确切表达，其传统实现方法是直接将代码嵌入到客户应用程序中。这就使得算法的实现代码经过针对不同被求解函数的少量修改后在客户程序中反复出现。 同许多其它数学例程一样，Newton-Raphson算法的具体实现是应该与特定用户无关的。并且，重复编码在任何情况下都应该尽量避免。我们很自然地会想到把该类例程作为库函数来实现，以使客户程序可以直接调用它们。但是，这种实现方式必然会涉及到如何将用户自定义函数（Newton-Raphson 例程需要调用该函数）封装成可以作为参数传递的形式。 (err)

输入图片，求出图片的偏振度以及偏振化方向(Input image, calculate the polarization degree and the polarization direction of the picture )

matlab入门的高清电子书，matlab是一个极好的数学编程工具，很多著名算法都采用matlab实现(HD e-book, matlab matlab entry is a the excellent mathematical programming tools, many well-known algorithm using matlab)

整理的关于FFT的matlab程序，所用matlab版本为2016b(The matlab program of FFT is arranged. The version of MATLAB is 2016b.)

天线方向图的波达方向，用于描述回波的方向图3，可以用于初学者学习使用(DOA antenna pattern, used to describe the echo pattern 3, can be used for beginners to learn to use)