# Connected Scatterplot

A connected scatterplot is a line chart where each data point is shown by a circle or any type of marker. This section explains how to build a connected scatterplot with `Python`

, using both the `Matplotlib`

and the `Seaborn`

libraries.

## ⏱ Quick start

Building a connected scatterplot with Python and Matplotlib is a breeze thanks to the `plot()`

function. The 2 first argumenst are the X and Y values respectively, which can be stored in a `pandas`

data frame.

The `linestyle`

and `marker`

arguments allow to use line and circles to make it look like a connected scatterplot. It means everything is very close to a line chart or a scatterplot that are extensively described in the gallery.

```
# libraries
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
# data
df = pd.DataFrame({
'x_axis': range(1,10),
'y_axis': np.random.randn(9)*80+range(1,10)
})
# plot
plt.plot('x_axis', 'y_axis', data=df, linestyle='-', marker='o')
plt.show()
```

## ⚠️ Two types of connected scatterplot

There are two types of connected scatterplot, and it often creates confusion.

The __first__ is simply a lineplot with dots added on top of it. It takes as input 2 numeric variables only. The __second__ shows the relationship between 2 numeric variables across time. It requires 3 numeric variables as input.

Confusing? Visit data-to-viz to clarify..

## Connected scatterplot with `Seaborn`

Building a connected scatterplot with `Seaborn`

looks pretty much the same as for a line chart. It is made thanks to the `lineplot()`

function.

Click the following images to get a long form tutorial on how to create a **basic connected scatterplot** with Seaborn, how to draw **multiple groups** and how to **customize the lines** and the **markers**.

## Connected scatterplot with `Matplotlib`

As for scatterplots, `Matplotlib`

will help us build a bubble plot thanks to the the `plt.scatter()`

function. This function provides a `s`

parameter allowing to pass a third variable that will be mapped to the markers size.

Cheatsheet: line customization with `Matplotlib`

and the `linestyle`

parameter.

## Connected scatterplot for 2 variables

As explained above, a connected scatterplot can also be base on 3 numeric variables. It allows to study the evolution of 2 variables (placed on the X and on the Y axis).

## Best python connected scatterplot examples

The web is full of astonishing charts made by awesome bloggers, (often using R). The Python graph gallery tries to display (or translate from R) some of the best creations and explain how their source code works. If you want to display your work here, please drop me a word or even better, submit a Pull Request!