when i try to implement the pca from your site i get the following. please suggest me what am doing wrong.
NameError Traceback (most recent call last)
in ()
11 for col in range(4):
12 for key in colors:
ā> 13 traces.append(Histogram(x=X[y==key, col],
14 opacity=0.75,
15 xaxis=āx%sā %(col+1),
NameError: name āXā is not defined