python - Plotting a polygon with matplotlib, error with vertices -

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i'm trying plot polygon x^11+1=0, , i've got error matrix's dimension. matrix elements polygon's vertices. code:

import numpy np import matplotlib.pyplot plt matplotlib.collections import polycollection   n = 11 verticesx = np.empty(shape=0) k in np.arange(n):     verticesx = np.append(verticesx, [[np.cos(np.rad2deg((2 * k + 1) / n * np.pi))],                                       [np.sin(np.rad2deg((2 * k + 1) / n * np.pi))]]) print(verticesx) plt.subplot(aspect='equal') plt.xlim(-1.5, 1.5) plt.ylim(-1.5, 1.5) circle = plt.circle((0, 0), 1, color='b', fill=false) poly = polycollection(verticesx, facecolor='r', edgecolor='g', closed=true) plt.gcf().gca().add_artist(circle) plt.gcf().gca().add_artist(poly)

the error message one:

[-0.79263773 -0.6096929   0.38593669 -0.92252527  0.99066117  0.13634679   0.12236983  0.99248457 -0.92787342  0.37289531 -0.59846007 -0.80115264   0.6208046  -0.78396533  0.91699383  0.39890139 -0.15029666  0.98864094      -0.99411079  0.10836856 -0.35977985 -0.93303722]  traceback (most recent call last):   file "f:/miscosas/programaspython3/circunferencia/circunferenciaunidad.py", line 15, in <module>     poly = polycollection(verticesx, facecolor='r', edgecolor='g', closed=true)   file "c:\anaconda3\lib\site-packages\matplotlib\collections.py", line 867, in __init__     self.set_verts(verts, closed)   file "c:\anaconda3\lib\site-packages\matplotlib\collections.py", line 878, in set_verts     if len(xy): typeerror: object of type 'numpy.float64' has no len()  process finished exit code 1 

import numpy np __future__ import division import matplotlib.pyplot plt matplotlib.collections import polycollection   n = 11 verts = []  k=np.linspace(0,n,1.0)  k in range(n):     a=360/11/180*np.pi     x= np.cos( k*a )      y= np.sin( k*a )      verts.append((x,y))     # appending numpy array works differently appending list   plt.subplot(aspect='equal') # plt.xlim(-1.5, 1.5) # plt.ylim(-1.5, 1.5) circle = plt.circle((0, 0), 1, color='b', fill=false)  # need pass collection here, not 1 polygon, solve putting brackets around poly = polycollection([verts], facecolor='r', edgecolor='g', closed=true)   plt.gcf().gca().add_artist(circle) plt.gcf().gca().add_artist(poly) plt.xlim(-1, 1) plt.ylim(-1, 1) plt.show()

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