MAT之PCA：利用PCA(四個主成分的貢獻率就才達100%)降維提高測試集辛烷值含量預測準確度並《測試集辛烷值含量預測結果對比》

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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