"""
=================================================
Plot robust principal components analysis (PCA)
=================================================

visualizes the robust PCA component analysis from hydro-geological data
"""
# Author: L.Kouadio 
# Licence: BSD-3-clause 

#%% 
# Visualize the first two components PC1 and PC2

from watex.datasets import load_bagoue 
from watex.view.mlplot import EvalPlot 
X , y = load_bagoue(as_frame =True )
b=EvalPlot(tname ='flow', encode_labels=True ,
                          scale = True )
b.fit_transform (X, y)
b.plotPCA (n_components= 2 )
# Note that pc1 and pc2 labels > n_components -> otherwise  raises user warnings
# Axis 1 and 2 is the default behaviour. 
# Runing the script below shows the same figure as the above. 

# b.plotPCA (n_components= 2 , biplot=False, pc1_label='Axis 1',
#                       pc2_label='axis 2')
# UserWarning: Number of components and axes might be consistent;
# '2'and '4 are given; default two components are used.
   
#%% 
# can visulizalise the other components axis in Axis 3 and 4. Note for PC1 and PC2 labels must be consistent
# with the number of components. 
#  
b.plotPCA (n_components= 8 , biplot=False, pc1_label='Axis3',
                         pc2_label='axis4')
# # works fine since n_components are greater to the number of axes