How to Fine-Tune Matplotlib Colorbar Height to Match Your Graph?

Fine-tuning Matplotlib Colorbar Height to Match Graph

Adjusting the size of a colorbar in Matplotlib can be a persistent challenge, especially when aiming to have it match the height of the graph it complements. Fortunately, there's a reliable solution that eliminates the need for post-hoc image editing.

The key lies in setting the fraction and pad parameters for the colorbar() function. After experimenting with various values, it has been discovered that the following combination consistently results in a colorbar scaled to the plot:

plt.colorbar(im, fraction=0.046, pad=0.04)

By setting fraction to 0.046 and pad to 0.04, the colorbar is automatically sized to match the graph, regardless of the display size. This approach also avoids the issue of axis sharing, which can cause the plot to become out of square.

Simply incorporate this line of code into your Matplotlib graphing routine, and you'll enjoy perfectly scaled colorbars that seamlessly complement your graphs.

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