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POCustom plot linestyle in matplotlib
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copied!<p>I'm trying to achieve graph using <code>matplotlib</code> with lines with whitespaces near points like in this one:</p> <p><a href="http://simplystatistics.org/wp-content/uploads/2013/01/Beijingair.png" rel="nofollow noreferrer">graph.png http://simplystatistics.org/wp-content/uploads/2013/01/Beijingair.png</a></p> <p>I know about <code>set_dashes</code> function, but it sets periodic dashes from start-point without control over end-point dash.</p> <p><strong>EDIT:</strong> I made a workaround, but the resulting plot is just a bunch of usual lines, it is not a single object. Also it uses another library <code>pandas</code> and, strangely, works not exactly as I expected - I want equal offsets, but somehow they are clearly relative to the length.</p> <pre><code>import numpy as np import matplotlib import matplotlib.pyplot as plt import pandas as pd def my_plot(X,Y): df = pd.DataFrame({ 'x': X, 'y': Y, }) roffset = 0.1 df['x_diff'] = df['x'].diff() df['y_diff'] = df['y'].diff() df['length'] = np.sqrt(df['x_diff']**2 + df['y_diff']**2) aoffset = df['length'].mean()*roffset # this is to drop values with negative magnitude df['length_'] = df['length'][df['length']>2*aoffset]-2*aoffset df['x_start'] = df['x'] -aoffset*(df['x_diff']/df['length']) df['x_end'] = df['x']-df['x_diff']+aoffset*(df['x_diff']/df['length']) df['y_start'] = df['y'] -aoffset*(df['y_diff']/df['length']) df['y_end'] = df['y']-df['y_diff']+aoffset*(df['y_diff']/df['length']) ax = plt.gca() d = {} idf = df.dropna().index for i in idf: line, = ax.plot( [df['x_start'][i], df['x_end'][i]], [df['y_start'][i], df['y_end'][i]], linestyle='-', **d) d['color'] = line.get_color() ax.plot(df['x'], df['y'], marker='o', linestyle='', **d) fig = plt.figure(figsize=(8,6)) axes = plt.subplot(111) X = np.linspace(0,2*np.pi, 8) Y = np.sin(X) my_plot(X,Y) plt.show() </code></pre> <p><img src="https://i.stack.imgur.com/0sGCO.png" alt="enter image description here"></p>

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