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    <p>First of all, it's not very tidy to mix <code>pylab</code> and <code>pyplot</code> code. What's more, <a href="http://matplotlib.org/faq/usage_faq.html#matplotlib-pyplot-and-pylab-how-are-they-related" rel="noreferrer">pyplot style is preferred over using pylab</a>.</p> <p>Here is a slightly cleaned up code, using only <code>pyplot</code> functions:</p> <pre><code>from matplotlib import pyplot a = [ pow(10,i) for i in range(10) ] pyplot.subplot(2,1,1) pyplot.plot(a, color='blue', lw=2) pyplot.yscale('log') pyplot.show() </code></pre> <p>The relevant function is <a href="http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.yscale" rel="noreferrer"><code>pyplot.yscale()</code></a>. If you use the object-oriented version, replace it by the method <a href="http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.set_yscale" rel="noreferrer"><code>Axes.set_yscale()</code></a>. Remember that you can also change the scale of X axis, using <a href="http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.xscale" rel="noreferrer"><code>pyplot.xscale()</code></a> (or <a href="http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.set_xscale" rel="noreferrer"><code>Axes.set_xscale()</code></a>).</p> <p>Check my question <a href="https://stackoverflow.com/questions/3305865/what-is-the-difference-between-log-and-symlog">What is the difference between ‘log’ and ‘symlog’?</a> to see a few examples of the graph scales that matplotlib offers.</p>
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