PCA-analysis tool for analyzing endogenous patient breath 
Taking csv file input data, the code produces the following figures: 

Figure 1: Mass Spectra of Healthy Human Breath on July 20th, 2017 
The samples were measured from July 20th, 2017 to August 17th, 2017

Figure 2:  Variances explained by each PCs

Figure 3: Losses incurred by each different numbers of PCs

Figure 4: Visualization of data set on first and second PCs

Figure 5: Heat map of each features (m/z) accounted in each PCs