Python - Plotting Dynamic Dataset

Question

I have a dataset that receives manual input that adds rows one-by-one. I want to create a scatterplot to plot the data and update when more data is added. Using matplotlib, how would I go about updating the existing plot, instead of redrawing the entire thing? I have the plot all laid out, it's just adding the points. So here's what I have so far:

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt


df = pd.DataFrame([[1, 3.00]], columns=['At_Bat', 'Stand'])

plt.ion()

x = np.arange(0, 999, 0.1)

y1 = -5
y2 = .75
y3 = 2.25
y4 = 5

plt.fill_between(x, y1, y2, color='lawngreen', alpha='.6')
plt.fill_between(x, y2, y3, color='yellow', alpha='.6')
plt.fill_between(x, y3, y4, color='red', alpha='.6')

plt.scatter(df.At_Bat, df.Stand)
plt.plot(df.At_Bat, df.Stand)
plt.axhline(y=0, color='black')
plt.xticks(np.arange(0, df.Stand.max() + 1))
plt.ylim([-4, 4])
plt.xlim([0, df.Stand.max() + 1])

df2 = pd.DataFrame([[2, 2.50]])
df = np.append(df, df2, axis = 0)

So df contains the first point, and then each additional point is added using df2 and append.

have a look (matplotlib.org/examples/animation/basic_example.html) — R.yan
– R.yan, Commented May 2, 2018 at 6:32

SpghttCd · Accepted Answer · 2018-05-02 08:06:49Z

1

Just add

plt.scatter(df2[0], df2[1])

after your code - this should append the next point of data stored in df2 to the existing plot.

If you don't like the different color, you can save the first point in your code in a variable like

ps = plt.scatter(df.At_Bat, df.Stand)

and add new data afterwards then like

plt.scatter(df2[0], df2[1], fc = ps.get_facecolor())

answered May 2, 2018 at 8:06

SpghttCd

10.9k2 gold badges23 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Python - Plotting Dynamic Dataset

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related