互补分类器所用的特征为差主分量（DPC， Difference Principal Component），具体的方法如下：设R为原有分类器条件下一个已知类的特征上相似但并非同类的模式。
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Results Principal component analysis of FTIR Spectroscopy exhibited practical value on reflecting the degree of difference in chemical compositions among different species from the same genera.
结果FTIR的主成分分析在反映同属不同种植物化学组成差异程度上具有应用价值。
Principal component analysis showed the significant difference in soil fungal community compositions between treatment of sole chemical fertilizer and others.
主成分分析结果表明单施化肥处理的真菌群落组成与其他各处理存在显著差异。
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