Scatter plot with arrows using matplotlib

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 -

This is the result

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!

You could try combining a scatter plot with arrows

GWW
– GWW

2014-07-27 02:42:55 +00:00
Commented Jul 27, 2014 at 2:42 — GWW
– GWW, Commented Jul 27, 2014 at 2:42

Dan · Accepted Answer · 2014-07-27 04:24:45Z

4

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])

answered Jul 27, 2014 at 4:24

Dan

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4 Comments

tacaswell Over a year ago

actually, there is a kwarg (pivot_point?) that controls where the arrow rotates around.

Dex Over a year ago

Is there anyway to change the size of a quiver without scaling it some property of the plot? I'd like bigger arrows than the default but in the documentation I only see relative scaling for the size of the arrows.

Dan Over a year ago

Sorry, not sure that i'm following you. the argument scale= will change the length of all of the arrows. width= will make them heavier, but not longer. Are neither of those what you're after?

Dex Over a year ago

I was misreading the documentation, yes, scale is what I was looking for. Thanks.

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