Question

我正在尝试创建一个程序：

从用户选择的csv文件中检索数据
绘制数据
在窗口上显示图形
允许用户更改绘图参数（color，linestyle ...）
将绘图保存在用户以PS格式

步骤1到4工作正常，但第5步让我觉得我已经杀了matplotlib ......

我使用与之前版本相同的语法进行保存，效果很好：

        def savePlot(self):
    self.saveDirectory = QFileDialog.getExistingDirectory(None, 'Chose where you want to save','/home',QFileDialog.ShowDirsOnly | QFileDialog.DontResolveSymlinks)

    if self.plotParam==[]:
        plt.savefig(self.saveDirectory + "/" + "Untiltled.ps", dpi = 1200)

    else :
        plt.savefig(self.saveDirectory + "/" + "%s.ps" %self.plotParam[0],format = 'ps', dpi = 1200)

Here是完整代码的链接，here是我正在使用的数据文件。

在此部分中，self.plotParam是一个最初为空的列表，如果用户想要更改默认值，则包含绘图参数。

以下是错误日志：

    Traceback (most recent call last):
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/colors.py", line 141, in to_rgba
        rgba = _colors_full_map.cache[c, alpha]
    TypeError: unhashable type: 'numpy.ndarray'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/home/antoine/CERB/courbes/courbesv2.py", line 354, in savePlot
        plt.savefig(self.saveDirectory + "/" + "essai.ps", dpi = 1200)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/pyplot.py", line 697, in savefig
        res = fig.savefig(*args, **kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/figure.py", line 1573, in savefig
        self.canvas.print_figure(*args, **kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_qt5agg.py", line 222, in print_figure
        FigureCanvasAgg.print_figure(self, *args, **kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backend_bases.py", line 2252, in print_figure
**kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_ps.py", line 957, in print_ps
        return self._print_ps(outfile, 'ps', *args, **kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_ps.py", line 988, in _print_ps
**kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_ps.py", line 1078, in _print_figure
        self.figure.draw(renderer)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/artist.py", line 63, in draw_wrapper
        draw(artist, renderer, *args, **kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/figure.py", line 1144, in draw
renderer, self, dsu, self.suppressComposite)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/image.py", line 139, in _draw_list_compositing_images
        a.draw(renderer)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/artist.py", line 63, in draw_wrapper
        draw(artist, renderer, *args, **kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/axes/_base.py", line 2426, in draw
        mimage._draw_list_compositing_images(renderer, self, dsu)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/image.py", line 139, in _draw_list_compositing_images
        a.draw(renderer)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/artist.py", line 63, in draw_wrapper
        draw(artist, renderer, *args, **kwargs)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/collections.py", line 354, in draw
        self._offset_position)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backends/backend_ps.py", line 607, in draw_path_collection
offset_position)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backend_bases.py", line 309, in draw_path_collection
antialiaseds, urls, offset_position):
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backend_bases.py", line 497, in _iter_collection
        gc0.set_foreground(fg)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/backend_bases.py", line 1027, in set_foreground
        self._rgb = colors.to_rgba(fg)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/colors.py", line 143, in to_rgba
        rgba = _to_rgba_no_colorcycle(c, alpha)
      File "/home/antoine/miniconda3/lib/python3.6/site-packages/matplotlib/colors.py", line 204, in _to_rgba_no_colorcycle
        raise ValueError("RGBA values should be within 0-1 range")
    ValueError: RGBA values should be within 0-1 range

我尝试过使用与.ps不同的扩展程序，并且所有这些扩展程序都显示相同的错误，除了.png，这为我节省了令人作呕的糟糕图像，即使它应该是1200 dpi（我无法向您发送保存图片的链接，因为我没有足够的声誉，抱歉。

我也试过做一条干净的路径＆＃34;使用os.path.join，但它没有改变任何内容，所以我恢复了以前版本的语法。

我知道我的代码很可能不是最理想的，但我正在学习，所以它无法得到帮助...

你有解决这个问题的线索吗？

编辑：添加了最小，完整且可验证的示例：

    import matplotlib.pyplot as plt

    data = [[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10],[0.2,0.2,0.2,0.2,0.2,0.2,0.2,0.2,0.2,0.2]]

    def plotAttempt():
        plt.errorbar(data[0],data[1],data[2],0)
        path = '/home/PlotAttempt.ps'
        plt.savefig(path)

通过控制台调用plotAttempt（）会得到相同的错误日志

Answer 1

这似乎是一个pyzo bug，当我通过控制台运行它时，代码工作正常，重新启动后它也可用于pyzo。

savefig（）导致ValueError：RGBA值应在0-1范围内

1 个答案: