使用matplotlib使用箭头散点图

Question

I'm trying to make a scatter plot in matplotlib with arrows coming out of the points to indicate upper limits. To this end I've done the following,

arrow = u'$\u2193$'
ax.plot(x, y, linestyle='none', markersize=20, marker=arrow)
ax.plot(x, y, linestyle='none', markersize=10, marker='o')

However, I'm not totally satisfied with the results -

I'd like the arrows to come out of the middle of the points. So that point+arrow looks more like a single shape. Is there a way to do this?

Thanks!

Answer 1

you can do this with quiver . It takes position and direction data to make plots full of arrows. But they'll start at the x,y rather than being centered (as you found in plot)

x=[4.0,7.0,4.5]
y=[3.0,1.0,5.5]
u=[0,0,0]
v=[1,1,1]
fig, ax = subplots()
ax.quiver(x,y,u,v)
ax.scatter(x,y,color='k')
ax.axis([0,10,0,10])