I want to draw an unit circle(cos+sin), using numpy and matplotlib. I wrote the following:
t = np.linspace(0,np.pi*2,100)
circ = np.concatenate((np.cos(t),np.sin(t)))
and I plotted, but failed.
ax.plot(t,circ,linewidth=1)
ValueError: x and y must have same first dimension
plot does not do a parametric plot. You must give it the x and y values, not t.
x is cos(t) and y is sin(t), so give those arrays to plot:
ax.plot(np.cos(t), np.sin(t), linewidth=1)
Or you can use Circle (http://matplotlib.org/api/patches_api.html):
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
circ = plt.Circle((0, 0), radius=1, edgecolor='b', facecolor='None')
ax.add_patch(circ)
plt.show()
