Python Data Science Handbook by Jake VanderPlas

Author:Jake VanderPlas
Language: eng
Format: epub, mobi, pdf
Publisher: O'Reilly Media, Inc.
Published: 2016-12-06T05:00:00+00:00

In[11]: plt.imshow(I, cmap=plt.cm.get_cmap('Blues', 6)) plt.colorbar() plt.clim(-1, 1);

Figure 4-56. A discretized colormap

The discrete version of a colormap can be used just like any other colormap.

Example: Handwritten Digits

For an example of where this might be useful, let’s look at an interesting visualization of some handwritten digits data. This data is included in Scikit-Learn, and consists of nearly 2,000 8×8 thumbnails showing various handwritten digits.

For now, let’s start by downloading the digits data and visualizing several of the example images with plt.imshow() (Figure 4-57):

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