Do you want to plot points in matplotlib ? Then you have come to the right place. In this entire tutorial, you will learn how to plot points in matplotlib using various methods.
What are the points?
For plotting any figure you generally need two values. One for the x coordinate and the other y- coordinate. If you pair them both then there are called points (x,y). Points can be of two dimensional(x,y) or three dimensional(x,y,z). There are many figures you can plot using these points like line chart, scatter chart e.t.c. In this tutorial, I will plot a scatter chart.
Steps to Plot Points in Matplotlib
In this section, you will know all the steps required to plot points in Matplotlib. Please follow them for more understanding.
Step 1: Import all the necessary libraries
The first step is to import all the required libraries for this tutorial. I am using NumPy and matplotlib . So let’s import them.
import numpy as np import matplotlib.pyplot as plt
Step 2: Cream Sample Data Points
Before plotting the data points let’s create sample data points. Here I am creating points in two ways. The first way is x and y have separate values. The second way is to take x and y as pair (x,y).
Let’s create them.
x = [-1,-2,-3,-4,1,2,3,4] y = [1,4,9,16,1,4,9,16]
points = [(-1,1),(-2,4),(-3,9),(-4,16),(1,1),(2,4),(3,9),(4,16)]
Here I take a list of tuples contacting x and y data points values.
In the next step, We will plot the figure using these samples.
Step 3: Plot the data point using Matplotlib
After the creation of the data points, let’s plot them. Here I will plot scatter plot only. You may plot any chart that accepts x and y values.
Plotting Figure using the separate x and y values
Execute the below lines of code and see the output.
import numpy as np import matplotlib.pyplot as plt x = [-1,-2,-3,-4,1,2,3,4] y = [1,4,9,16,1,4,9,16] plt.scatter(x, y) plt.show()
You can see the plot It is parabolic that is it follows the equation y=x^2.
Plotting Figure using x and y as pair
Now, let’s take points as a pair and plot scatter plot on them. Just run the below lines of code and see the output.
import numpy as np import matplotlib.pyplot as plt points = [(-1,1),(-2,4),(-3,9),(-4,16),(1,1),(2,4),(3,9),(4,16)] plt.scatter(*zip(*points))
Here *zip(*points) will unpack data points into the list.
These are methods to Plot Points in Matplotlib. You can use any method you want. The choice depends on whether you are taking input data points as a pair or separately. Hope you have liked this tutorial and it has solved your queries. Even you are facing difficulties then you can contact us for more help.
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