Seaborn is a visualization library that is built on top of Matplotlib. Y_combined = np. Matplotlib is a library in Python that enables users to generate visualizations like histograms, scatter plots, bar charts, pie charts and much more.

X_combined_std = np.vstack((X_train_std, X_test_std)) Plt.contourf(xx1, xx2, Z, alpha=0.3, cmap=cmap) The goal is to draw empty circles around some of the colored disks already plotted by scatter(), so as to highlight them, ideally without having to redraw the. Xx1, xx2 = np.meshgrid(np.arange(x1_min, x1_max, resolution), the error I am getting is ValueError: 'c' argument must be a color, a sequence of colors, or a sequence of numbers, notįrom lors import ListedColormapĭef plot_decision_regions(X, y, classifier, test_idx=None, resolution=0.02):Ĭolors = (‘red’, ‘blue’, ‘lightgreen’, ‘gray’, ‘cyan’)Ĭmap = ListedColormap(colors) You can specify one color for all the circles, or you can vary the color. For the scatter plots, make the size 0 but use it to set the colorbar. In other words, in a very simplified example, I want the result to look like this. I want to highlight several of these points, by drawing an open circle around them and connecting these with a line. First draw the unfilled circles, then do a scatter plot with the same points. 11 I have a scatter plot showing a data set with the symbols coloured according some colour scale. You can use Preludes command to do a second scatter plot of the hightlighted points with an empty circle and a first call to plot all the points. 2 Answers Sorted by: 9 I believe doing both approaches may achieve what you are trying to do. I am not sure I think I have a new version of matplotlib v3.4.2, other students are using versions 3.3.2 & 3.3.4. scatter( x, y, sz, c ) specifies the circle colors. So I assume you want to highlight some points that fit a certain criteria. In Chapter 3 page 89 there are examples creating circles around the plots to identify as test sets. Make sure the s paramter is sufficiently small for the larger empty circles to enclose the smaller filled ones. I using the example in the book Python Machine Learning by Sebastian Raschkla. You can use Prelude's command to do a second scatter plot of the hightlighted points with an empty circle and a first call to plot all the points.

Pyplot scatter unfilled circle