quaternion2euler

四元数实现的三维空间的表达形式，具有表达式简单，运算精度高，占有存储空间小等优点。(quaternion achieve the three-dimensional space of expression, the expression is simple, high precision computing, possession of small storage space advantages.)

支持向量机参数选择，利用网格搜索法确定支持向量机的惩罚因子和RBF核参数(Support vector machine (SVM) parameters choice, the grid search method is used to determine the punishment factor and RBF kernel parameters of support vector machine (SVM))

implement onDraw and draw a rectangle in a random color with the name of the class.

基于小波变换的图像融合，包括图像的预处理和小波系数的选取(image fusion based on wavelet transform)

使用中科院虹膜数据库，实现了虹膜内外边界定位(Iris database using the Chinese Academy of Sciences, to achieve both inside and outside the iris boundary localization)

PWE（平面波展开法）计算二维固-固圆柱形声子晶体的XY模式。(PWE (plane wave expansion method) to calculate the two-dimensional solid- XY mode phonon solid cylindrical crystals.)

对信号进行小波包分解，得到节点的小波包系数。然后对每个节点系数进行重构。(Wavelet packet decomposition is used to get the wavelet packet coefficients of the nodes. Then the coefficients of each node are reconstructed.)

good demo of neural networks!

刘金坤先进PID控制第二版第一章的仿真程序(Advanced PID control刘金坤the first chapter of the second edition of Simulation Program)

本程序利用奇异值分解对3通道彩色图像进行压缩分解，具体步骤如下： 压缩过程： 1. 选取子图像大小K值，把图像分解成M×M个子图像，IMG(s),s=1,2,…, M2，其中M=N/K，原始图像IMG大小为N×N。 2. 计算这M2个子图像的平均值average，对每幅子图像减去均值图像得到新图像。 3. 计算相关矩阵R，其元素定义为 。 4. 计算R的特征值与特征向量，计算每幅子图像与最大特征向量的内积，便得到编码，即压缩后的图像。 (This procedure using singular value decomposition of 3-channel color image compression decomposition, concrete steps are as follows: compression process: 1. Select the sub-image size K value, the image is decomposed into M × M sub-image, IMG (s), s = 1, 2, ..., M2, in which M = N/K, the original image IMG size N × N. 2. M2 calculate the average of sub-image average, for each sub-image minus the new images mean images. 3. Calculation of correlation matrix R, defined as its elements. 4. Calculation of the characteristics of R value and eigenvector calculated each sub-image with the largest eigenvector of the inner product, they will have to code, that is, the compressed images.)