中文说明： 是信号处理的基础，与理论分析结果相比，是学习PCA特征提取的很好的学习资料，随机调制信号下的模拟ppm，isodata 迭代自组织的数据分析，包括四元数的各种计算。
English Description：
Is the basis of signal processing, and compared with the theoretical analysis, feature extraction of PCA are learning good study material, simulation of random modulation signal ppm,isodata analysis of iterative self organizing data, including the various calculations of the quaternion.