python - 如何自动设置x轴的大小

Question

变量 x 从 0 到 19。但是我还有其他示例，它会从 0 到 28 或从 0 到 5。那么，我如何将其设置为自动，而不是像我所做的那样写入所有数字在“plt.xticks”中？

    for i in range(x.shape[1]): 
        xA=x[:, i].reshape(-1,1)
        skf = StratifiedKFold(y, n_folds=2, shuffle=True)
        scoresSKF = cross_validation.cross_val_score(clf, xA, y, cv=skf)

        plt.ylabel('Accuracy')
        plt.xlabel('Features')    
        plt.title('Accuracy by feature: Random Forest')

        plt.xticks([0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11, 12, 13, 14, 15, 16, 17, 18, 19], rotation = 'vertical')
    plt.show()

Answer 1

您必须使用 numpy 中的 arange:http://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html

import numpy
...
x_ticks = numpy.arange(20) # generate a seq from 0 to 19, step is one.
plt.xticks(x_ticks, rotation = 'vertical')
...