In [10]:

    

%matplotlib inline
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt
import numpy as np


    

In [7]:

    

a = np.load('color_quantization/quantized_counts.npy')


    

In [11]:

    

plt.hist(a)
plt.show()


    

    




---------------------------------------------------------------------------
TclError                                  Traceback (most recent call last)
<ipython-input-11-11892850dbc6> in <module>()
----> 1 plt.hist(a)
      2 plt.show()

/usr/lib/pymodules/python2.7/matplotlib/pyplot.pyc in hist(x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, hold, **kwargs)
   2814          rwidth=None, log=False, color=None, label=None, stacked=False,
   2815          hold=None, **kwargs):
-> 2816     ax = gca()
   2817     # allow callers to override the hold state by passing hold=True|False
   2818     washold = ax.ishold()

/usr/lib/pymodules/python2.7/matplotlib/pyplot.pyc in gca(**kwargs)
    801     """
    802 
--> 803     ax =  gcf().gca(**kwargs)
    804     return ax
    805 

/usr/lib/pymodules/python2.7/matplotlib/pyplot.pyc in gcf()
    448         return figManager.canvas.figure
    449     else:
--> 450         return figure()
    451 
    452 fignum_exists = _pylab_helpers.Gcf.has_fignum

/usr/lib/pymodules/python2.7/matplotlib/pyplot.pyc in figure(num, figsize, dpi, facecolor, edgecolor, frameon, FigureClass, **kwargs)
    421                                         frameon=frameon,
    422                                         FigureClass=FigureClass,
--> 423                                         **kwargs)
    424 
    425         if figLabel:

/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.pyc in new_figure_manager(num, *args, **kwargs)
     77     FigureClass = kwargs.pop('FigureClass', Figure)
     78     figure = FigureClass(*args, **kwargs)
---> 79     return new_figure_manager_given_figure(num, figure)
     80 
     81 

/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.pyc in new_figure_manager_given_figure(num, figure)
     85     """
     86     _focus = windowing.FocusManager()
---> 87     window = Tk.Tk()
     88     window.withdraw()
     89 

/usr/lib/python2.7/lib-tk/Tkinter.pyc in __init__(self, screenName, baseName, className, useTk, sync, use)
   1765                 baseName = baseName + ext
   1766         interactive = 0
-> 1767         self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
   1768         if useTk:
   1769             self._loadtk()

TclError: no display name and no $DISPLAY environment variable

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