AttributeError：'numpy.ndarray'对象没有属性'get_matrix'

Question

我正在尝试使用mlpy绘制一个精彩的PCA，而c的{​​{1}}参数会导致异常。

数据集：http://mlpy.sourceforge.net/docs/3.5/_downloads/iris.csv

plt.scatter

我有以下错误：

import mlpy
from matplotlib.mlab import PCA
import matplotlib.pyplot as plt

def classification():
    # x: (observations x attributes) matrix
    x = np.array(iris)[:, :4]
    # y: classes (1: setosa, 2: versicolor, 3: virginica)
    outputs_file="/Users/vasques/Desktop/classification.csv"
    y = np.loadtxt(outputs_file, delimiter=',')[:, 4].astype(np.int)

    pca = mlpy.PCA() # new PCA instance
    pca.learn(x) # learn from data
    z = pca.transform(x, k=2) # embed x into the k=2 dimensional subspace

    plt.set_cmap(plt.cm.Paired)
    fig1 = plt.figure(1)
    title = plt.title("PCA")
    plot = plt.scatter(z[:, 0], z[:, 1], c=y)
    labx = plt.xlabel("First component")
    laby = plt.ylabel("Second component")
    plt.show()

当我在Traceback (most recent call last): File "/Library/Python/2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/Library/Python/2.7/site-packages/matplotlib/figure.py", line 1050, in draw func(*args) File "/Library/Python/2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/Library/Python/2.7/site-packages/matplotlib/axes/_base.py", line 2075, in draw a.draw(renderer) File "/Library/Python/2.7/site-packages/matplotlib/collections.py", line 729, in draw Collection.draw(self, renderer) File "/Library/Python/2.7/site-packages/matplotlib/artist.py", line 59, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/Library/Python/2.7/site-packages/matplotlib/collections.py", line 301, in draw self._offset_position) File "/Library/Python/2.7/site-packages/matplotlib/backends/backend_macosx.py", line 79, in draw_path_collection all_transforms = [t.get_matrix() for t in all_transforms] AttributeError: 'numpy.ndarray' object has no attribute 'get_matrix' 中删除c=y时，它会运行，但我只有一种颜色，不允许我识别这些群组。