是学习PCA特征提取的很好的学习资料，实现六自由度运动学逆解算法，FIR 底通和带通滤波器和IIR 底通和带通滤波器。- Is a good learning materials to learn PCA feature extraction, Six degrees of freedom to achieve inverse kinematics algorithm, Bottom-pass and band-pass FIR and IIR filter bottom pass and ba