使用python在x轴matplotlib中的值之间的间距值

时间:2015-05-27 01:40:29

标签: python matplotlib

我有一个FPR和TPR情节。在这里我想问一下如何在x轴之间调整间距值。我的代码如下:

  In [85]:

    fig, ax = plt.subplots(figsize=(8,6), dpi=80)
    ax.plot(x_iter1_TF , y_iter1_TF, label='Iter1', marker='o')
    ax.plot(x_iter5_TF, y_iter5_TF ,label='Iter5',  marker='v')
    ax.plot(x_iter10_TF, y_iter10_TF , label='Iter10',  marker='x')
    ax.plot(x_iter25_TF, y_iter25_TF , label='Iter20',  marker='+')
    ax.plot(x_iter50_TF, y_iter50_TF , label='Iter50',marker='D')
    ax.legend(loc=1); # upper left corner
    ax.set_xlabel('FPR')
    ax.set_ylabel('TPR')
    ax.set_xlim([0,1, 0.001])
    ax.set_ylim([0,1, 0.001])
    ---------------------------------------------------------------------------
    ValueError                                Traceback (most recent call last)
    <ipython-input-85-87b9ef379a9b> in <module>()
          8 ax.set_xlabel('FPR')
          9 ax.set_ylabel('TPR')
    ---> 10 ax.set_xlim([0,1, 0.001])
         11 ax.set_ylim([0,1, 0.001])

    C:\Python27\lib\site-packages\matplotlib\axes\_base.pyc in set_xlim(self, left, right, emit, auto, **kw)
       2524 
       2525         if right is None and iterable(left):
    -> 2526             left, right = left
       2527 
       2528         self._process_unit_info(xdata=(left, right))

    ValueError: too many values to unpack

enter image description here

在这里,我使用了ax.set_xlim([0,1,0.001]),其中0.001是x轴之间的间距值。不幸的是,我遇到了一个错误。我想我做错了方法来设置那些东西

1 个答案:

答案 0 :(得分:0)

正如我的评论中所述,set_xlim不接受“步骤”参数。另外,我认为你想要的方法是set_xticks,可以按如下方式使用:

In [13]: import numpy as np
    ...: ticks = np.arange(0, 2, 0.1)
    ...: ax.set_xticks(ticks)
    ...: fig

并给出以下结果:

enter image description here