问ValueError:绘制散点图时，RGBA值应在0-1范围内。

EN

fig, axes = plt.subplots(1,2)
axes[0].scatter(X.iloc[:,0], X.iloc[:,1], c=y)
axes[0].set_xlabel('x1')
axes[0].set_ylabel('x2')
axes[0].set_title('Before PCA')
axes[1].scatter(X_new[:,0], X_new[:,1], c=y)
axes[1].set_xlabel('PC1')
axes[1].set_ylabel('PC2')
axes[1].set_title('After PCA')
plt.show()

ValueError: RGBA values should be within 0-1 range

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-109-2c4f74ddce3f> in <module>
      1 fig, axes = plt.subplots(1,2)
----> 2 axes[0].scatter(X.iloc[:,0], X.iloc[:,1], c=y)
      3 axes[0].set_xlabel('x1')
      4 axes[0].set_ylabel('x2')
      5 axes[0].set_title('Before PCA')

~/anaconda3/lib/python3.7/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)
   1597     def inner(ax, *args, data=None, **kwargs):
   1598         if data is None:
-> 1599             return func(ax, *map(sanitize_sequence, args), **kwargs)
   1600 
   1601         bound = new_sig.bind(ax, *args, **kwargs)

~/anaconda3/lib/python3.7/site-packages/matplotlib/axes/_axes.py in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, verts, edgecolors, plotnonfinite, **kwargs)
   4495                 offsets=offsets,
   4496                 transOffset=kwargs.pop('transform', self.transData),
-> 4497                 alpha=alpha
   4498                 )
   4499         collection.set_transform(mtransforms.IdentityTransform())

~/anaconda3/lib/python3.7/site-packages/matplotlib/collections.py in __init__(self, paths, sizes, **kwargs)
    881         """
    882 
--> 883         Collection.__init__(self, **kwargs)
    884         self.set_paths(paths)
    885         self.set_sizes(sizes)

~/anaconda3/lib/python3.7/site-packages/matplotlib/collections.py in __init__(self, edgecolors, facecolors, linewidths, linestyles, capstyle, joinstyle, antialiaseds, offsets, transOffset, norm, cmap, pickradius, hatch, urls, offset_position, zorder, **kwargs)
    125 
    126         self._hatch_color = mcolors.to_rgba(mpl.rcParams['hatch.color'])
--> 127         self.set_facecolor(facecolors)
    128         self.set_edgecolor(edgecolors)
    129         self.set_linewidth(linewidths)

~/anaconda3/lib/python3.7/site-packages/matplotlib/collections.py in set_facecolor(self, c)
    676         """
    677         self._original_facecolor = c
--> 678         self._set_facecolor(c)
    679 
    680     def get_facecolor(self):

~/anaconda3/lib/python3.7/site-packages/matplotlib/collections.py in _set_facecolor(self, c)
    659         except AttributeError:
    660             pass
--> 661         self._facecolors = mcolors.to_rgba_array(c, self._alpha)
    662         self.stale = True
    663 

~/anaconda3/lib/python3.7/site-packages/matplotlib/colors.py in to_rgba_array(c, alpha)
    277             result[mask] = 0
    278         if np.any((result < 0) | (result > 1)):
--> 279             raise ValueError("RGBA values should be within 0-1 range")
    280         return result
    281     # Handle single values.

ValueError: RGBA values should be within 0-1 range