May 2018
Intermediate to advanced
556 pages
13h 21m
Japanese
book
Pythonデータサイエンスハンドブック ―Jupyter、NumPy、pandas、Matplotlib、scikit-learnを使ったデータ分析、機械学習
by Jake VanderPlas, 菊池 彰
Content preview from Pythonデータサイエンスハンドブック ―Jupyter、NumPy、pandas、Matplotlib、scikit-learnを使ったデータ分析、機械学習
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4.9
カラーバーのカスタマイズ
259
として、カラー表示グラフを提供しています。まず最初に、使用するモジュールをインポートして
Jupyter notebook
の設定を行います。
In[1]: import matplotlib.pyplot as plt
plt.style.use('classic')
In[2]: %matplotlib inline
import numpy as np
これまでに何度も見てきたように、最も単純なカラーバーは
plt.colorbar()
メソッドで作成で
きます（図 4-49）。
In[3]: x = np.linspace(0, 10, 1000)
I = np.sin(x) * np.cos(x[:, np.newaxis])
plt.imshow(I)
plt.colorbar();
図4-49 単純なカラーバー
ここでは、これらのカラーバーをカスタマイズし、さまざまな状況で効果的に使用するための方
法について説明します。
4.9.1
カラーバーのカスタマイズ
描画関数に対して
cmap
引数を使用して、カラーマップ（
colormap
）を指定できます（図4-50）。
In[4]: plt.imshow(I, cmap='gray');
260
4
章
Matplotlib ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.