Firstly, classification index system was set up, then was selected in 22 original variables by the principal component analysis.

首先建立指标体系，并运用主成分分析法对22个类型划分指标进行筛选。

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The result fo Principal Component Analysis (PCA) shows that the vegetative characters are the major characters in morphological classification of C.

主成分分析结果表明，营养器官是狗牙根形态分类的重要指标。

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This paper proposes a method based on Principal Component Analysis (PCA) combined with improved K-means for action potential classification.

基于此，提出基于主元分析(pca)和改进K均值相结合的动作电位分类方法。

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