Pythonista user- initiated programs do not run
<p>Hi I am using Pythonista 3:0 on the ipad. As a beginner I downloaded examples to try out. They worked for a while but now lwhen I try to run them there is no response.  All the sample  programs in the original Phthonista install work perfectly. </p>

<p>This for example does not work. Nothing happens when I press the triangle.
Thanks</p>

<pre><code># -*- coding: utf-8 -*-from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
from itertools import product, combinations
fig = plt.figure()
ax = fig.gca(projection='3d')
ax.set_aspect("equal")

#draw cube
r = [-1, 1]
for s, e in combinations(np.array(list(product(r,r,r))), 2): 
    if np.sum(np.abs(s-e)) == r[1]-r[0]: 
        ax.plot3D(*zip(s,e), color="b")

# draw sphere
u, v = np.mgrid[0:2*np.pi:20j, 0:np.pi:10j]
x=np.cos(u)*np.sin(v)
y=np.sin(u)*np.sin(v)
z=np.cos(v)
ax.plot_wireframe(x, y, z, color="r")

#draw a point
ax.scatter([0],[0],[0],color="g",s=100)

#draw a vector
from matplotlib.patches import FancyArrowPatch
from mpl_toolkits.mplot3d import proj3d

class Arrow3D(FancyArrowPatch):
    def __init__(self, xs, ys, zs, *args, **kwargs):
        FancyArrowPatch.__init__(self, (0,0), (0,0), *args, **kwargs)
        self._verts3d = xs, ys, zs

    def draw(self, renderer):
        xs3d, ys3d, zs3d = self._verts3d
        xs, ys, zs = proj3d.proj_transform(xs3d, ys3d, zs3d, renderer.M)
        self.set_positions((xs[0],ys[0]),(xs[1],ys[1]))
        FancyArrowPatch.draw(self, renderer)

a = Arrow3D([0,1],[0,1],[0,1], mutation_scale=20, lw=1, arrowstyle="-|&gt;", color="k")
ax.add_artist(a)
plt.show()
</code></pre>

<p>In my opinion, matplotlib of Pythonista might be upgraded from 0.9x to 1.x. You should use different syntax as follows.</p>

<pre><code># -*- coding: utf-8 -*-
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import numpy as np
from itertools import product, combinations

fig = plt.figure()
ax = Axes3D(fig)   ## it's different now.
ax.set_aspect("equal")
</code></pre>

python ipad matplotlib pythonista