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#!/usr/bin/python # -*- coding: utf-8 -*- """ ========================================================= PCA example with Iris Data-set ========================================================= Principal Component Analysis applied to the Iris dataset. See `here <https://en.wikipedia.org/wiki/Iris_flower_data_set>`_ for more information on this dataset. """ print(__doc__) # Code source: Gaël Varoquaux # License: BSD 3 clause import numpy as np import matplotlib.pyplot as plt from mpl_toolkits.mplot3d import Axes3D from sklearn import decomposition from sklearn import datasets np.random.seed(5) centers = [[1, 1], [-1, -1], [1, -1]] iris = datasets.load_iris() X = iris.data y = iris.target fig = plt.figure(1, figsize=(4, 3)) plt.clf() ax = Axes3D(fig, rect=[0, 0, .95, 1], elev=48, azim=134) plt.cla() pca = decomposition.PCA(n_components=3) pca.fit(X) X = pca.transform(X) for name, label in [('Setosa', 0), ('Versicolour', 1), ('Virginica', 2)]: ax.text3D(X[y == label, 0].mean(), X[y == label, 1].mean() + 1.5, X[y == label, 2].mean(), name, horizontalalignment='center', bbox=dict(alpha=.5, edgecolor='w', facecolor='w')) # Reorder the labels to have colors matching the cluster results y = np.choose(y, [1, 2, 0]).astype(np.float) ax.scatter(X[:, 0], X[:, 1], X[:, 2], c=y, cmap=plt.cm.spectral) ax.w_xaxis.set_ticklabels([]) ax.w_yaxis.set_ticklabels([]) ax.w_zaxis.set_ticklabels([]) plt.show()
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