numpymatplotlibgeometry

How to draw an unit circle using numpy and matplotlib

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
Solution

  • 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)