Label data when doing a scatter plot in python

Question

I want to label every dot I plot in python, and I didn't find a proper way to do it.

Assuming I have two lists of n elements called a and b, I print them this way :

    plt.figure()
    plt.grid()
    plt.plot(a , b , 'bo')
    plt.show()

I want to label every point with "Variable k" with k ranging from 1 to n obviously. Thanks for your time

Possible duplicate of How do I set the figure title and axes labels font size in Matplotlib? — Arpit Solanki
– Arpit Solanki, Commented Dec 27, 2016 at 18:01
^^ That is setting names for axis'. I believe he wants to label every individual point. — gold_cy
– gold_cy, Commented Dec 27, 2016 at 18:04
What have you tried? Please, please read How to Ask and minimal reproducible example. Stack Overflow has very high quality standards. — noɥʇʎԀʎzɐɹƆ
– noɥʇʎԀʎzɐɹƆ, Commented Dec 27, 2016 at 18:34
You're right Dmitry Polonskiy that's exactly what I want to do — apaillarse
– apaillarse, Commented Dec 27, 2016 at 18:35

Lucas · Accepted Answer · 2016-12-27 19:11:23Z

1

You can use the label plot parameter

x = np.random.random(3)
y = np.random.random(3)
z = np.arange(3)
colors = ["red", "yellow", "blue"]
c = ["ro", "yo", "bo"]

for i in z:
    plt.plot(x[i], y[i], c[i], label=colors[i] + ' ' + str(i))
plt.legend()

answered Dec 27, 2016 at 19:11

Lucas

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Community · Accepted Answer · 2017-05-23 12:33:47Z

1

Here is the best way of doing it I found :

plt.figure()
plt.scatter(a,b)
labels = ['Variable {0}'.format(i+1) for i in range(n)]
for i in range (0,n):
    xy=(a[i],b[i])
    plt.annotate(labels[i],xy)
plt.plot()

More infos : Matplotlib: How to put individual tags for a scatter plot

edited May 23, 2017 at 12:33

CommunityBot

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answered Dec 29, 2016 at 16:22

apaillarse

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