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POPut a gap/break in a line plot
 

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  1. POPut a gap/break in a line plot
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    <p>I have a data set with effectively "continuous" sensor readings, with the occasional gap.</p> <p>However there are several periods in which no data was recorded. These gaps are significantly longer than the sample period.</p> <p>By default, pyplot connects each data point to the next (if I have a line style set), however I feel that this is slightly misleading when it connects the two data points either side of a long gap.</p> <p>I would prefer to simply have no line there; that is, I would like the line to stop and to start again after the gap.</p> <p>I have tried adding in an element in these gap sections with the y-value <code>None</code>, but seems to send the line back to an earlier part of the plot (though strangely these lines don't appear at all zoom levels).</p> <p>The other option I have thought of is to simply plot each piece with a separate call to <code>plot</code>, but this would be a bit ugly and cumbersome.</p> <p>Is there a more elegant way of achieving this?</p> <p>Edit: Below is a minimal working example demonstrating the behaviour. The first plot is the joining line I am trying to avoid. The second plot shows that adding a <code>None</code> value appears to work, however if you pan the view of the plot, you get what is shown in the third figure, a line jumping to an earlier part of the plot.</p> <pre><code>import numpy as np import matplotlib.pyplot as plt t1 = np.arange(0, 8, 0.05) t2 = np.arange(10, 14, 0.05) t = np.concatenate([t1, t2]) c = np.cos(t) fig = plt.figure() ax = fig.gca() ax.plot(t, c) ax.set_title('Undesirable joining line') t1 = np.arange(0, 8, 0.05) t2 = np.arange(10, 14, 0.05) c1 = np.cos(t1) c2 = np.cos(t2) t = np.concatenate([t1, t1[-1:], t2]) c = np.concatenate([c1, [None,], c2]) fig = plt.figure() ax = fig.gca() ax.plot(t, c) ax.set_title('Ok if you don\'t pan the plot') fig = plt.figure() ax = fig.gca() ax.plot(t, c) ax.axis([-1, 12, -0.5, 1.25]) ax.set_title('Strange jumping line') plt.show() </code></pre> <p><img src="https://i.stack.imgur.com/MysYv.png" alt="Plot 3, the &quot;strange jumping line&quot;"></p>
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    1. USAlex
    1. USAlex
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    1. PO
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      1. POPut a gap/break in a line plot
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      1. POPut a gap/break in a line plot
      1. USBurhan Khalid
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    1. COWould it be possible to make a reproducible example, especially showing the matplotlib code you are currently using to plot?
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      1. USDavid Robinson
    2. COGood idea. Added the example.
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      1. USAlex
    3. COWhat if you call plot() twice? Ie. ax.plot(t1,c1) and ax.plot(t2,c2). You have to set the color manually: ax.plot(t1, c1, c = "b")
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      1. POPut a gap/break in a line plot
      1. USRobbert
 

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