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)
11 for col in range(4):
12 for key in colors:
—> 13 traces.append(Histogram(x=X[y==key, col],
15 xaxis=‘x%s’ %(col+1),
NameError: name ‘X’ is not defined