How to Draw a Heatmap Plot

What is heatmap?

heatmap is a useful chart that we can use to show the relationship between two variables. Heatmap displays a general view of numerical data; it does not extract specific data points. It is a graphical representation of data where the individual values contained in a matrix are represented as colors.

In Matplotlib, there is no native function for creating a heatmap, like there is with pie() or scatter(). However, there is another function, imshow(), which can help us create an image with the heatmap effect.

Plotting heatmap from imshow()

In order to create a heatmap, we can pass a 2-D array to imshow(). As we can see in the code ...