Fig. 1. The averaged Fourier-transform infrared spectra for different parts of Cordyceps (a); The similarities between each two parts of Cordyceps (b)

Fig. 2. The confusion matrix of independent data set by different methods
(a): CARS-PLS-DA; (b): CARS-LDA; (c): VCPA-PLS-DA; (d): VCPA-LDA

Fig. 3. The result of feature selection method CARS (a) and VCPA (b)

Fig. 4. The box-plot A (1 084, 1 024, 630, 879 cm^-1) and heat-map for Wilcoxon rank-sum test of wavenumbers selectedby CARS B(1 084, 1 024, 630, 879 cm^-1)

Fig. 5. The box-plot A(1 089, 1 028, 874, 625 cm^-1) and heat-map for Wilcoxon rank-sum test of wavenumbers selected by VCPA B(1 089, 1 028, 874, 625 cm^-1)