Matplotlib - Border around scatter plot points

Question

I would like to use Matplotlib to create a scatter plot with points that are colored inside, but have a black border, such as this plot:

However, when I copy the code exactly, I get this plot instead.

Here is the code:

colors = ['black', 'blue', 'purple', 'yellow', 'white', 'red', 'lime', 'cyan', 'orange', 'gray']
for i in range(len(colors)):
    x = reduced_data_rpca[:, 0][digits.target == i]
    y = reduced_data_rpca[:, 1][digits.target == i]
    plt.scatter(x, y, c=colors[i])
plt.legend(digits.target_names, bbox_to_anchor=(1.05, 1), loc=2, borderaxespad=0.)
plt.xlabel('First Principal Component')
plt.ylabel('Second Principal Component')
plt.title("PCA Scatter Plot")
plt.show()

I tried adjusting the style, but that didn't help.

If I were to take a guess; marker='o' but you haven't given a runnable example. — roganjosh
– roganjosh, Commented Jun 5, 2018 at 18:43

Alessandro Jacopson · Accepted Answer · 2022-01-03 12:49:41Z

71

When you use scatter plot, you set a color for both face and edge. In the official documentation you can find an additional parameter, edgecolors, which allows setting the edge color.

edgecolors : color or sequence of color, optional, default: None

If None, defaults to ‘face’

If ‘face’, the edge color will always be the same as the face color.

If it is ‘none’, the patch boundary will not be drawn.

For non-filled markers, the edgecolors kwarg is ignored and forced to ‘face’ internally.

So, after all, you need only plt.scatter(x, y, c=colors[i],edgecolors='black')

edited Jan 3, 2022 at 12:49

Alessandro Jacopson

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answered Jun 5, 2018 at 18:49

rth

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1 Comment

Mitchell van Zuylen Over a year ago

For people like me that needed transparent points with a non-transparent border. Combined edgecolor='b' with color='none'

mehmet uygur · Accepted Answer · 2023-12-07 15:09:24Z

3

you can add edgecolors parameter to your plt.scatter() method.

plt.scatter(x, y, c=colors[i], edgecolors='black')

Scatter plot of dataframe with edgecolor is enabled.

Not: At least it works for me. I am following this course.

edited Dec 7, 2023 at 15:09

answered Dec 7, 2023 at 15:06

mehmet uygur

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