MAT之PCA：利用PCA(四个主成分的贡献率就才达100%)降维提高测试集辛烷值含量预测准确度并《测试集辛烷值含量预测结果对比》

load  spectra;   <br> temp =  randperm ( size (NIR, 1));   P_train = NIR(temp(1:50),:); T_train = octane(temp(1:50),:);   P_test = NIR(temp(51: end ),:); T_test = octane(temp(51: end ),:);     [PCALoa

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