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plotting in log scale
2025-12-12 15:59:34 +00:00 · 2018-08-06 16:50:32 +02:00 · 2018-08-06 16:50:32 +02:00 · 232bc0d7d3
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--- a/cryptocurrencies/Installing_bitcoind_on_raspberry_pi.html
+++ b/cryptocurrencies/Installing_bitcoind_on_raspberry_pi.html
@ -286,7 +286,7 @@ maxuploadtarget=5000
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--- a/images/Plotting+data+using+log+axis/output_11_0.png
+++ b/images/Plotting+data+using+log+axis/output_11_0.png
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--- a/images/Plotting+data+using+log+axis/output_9_0.png
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--- a/index.html
+++ b/index.html
@ -294,6 +294,7 @@
      </div>
      <div class="panel-body">
        <ul>
+            <li><a href="./python/logplot.html">Plotting data using log axis</a></li>
            <li><a href="./python/Setting_up_the_notebook_for_plotting_with_matplotlib.html">Setting up the notebook for plotting with matplotlib</a></li>
            <li><a href="./python/Saving_a_matplotlib_figure_with_a_high_resolution.html">Saving a matplotlib figure with a high resolution</a></li>
        </ul>
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--- a/linux/Reloading_.bashrc.html
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@ -144,7 +144,7 @@ However, you can use the following command to do it </p>
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--- a/python/Saving_a_matplotlib_figure_with_a_high_resolution.html
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--- a/python/Setting_up_the_notebook_for_plotting_with_matplotlib.html
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+    <h1>
+      Plotting data using log axis
+    </h1>
+<ol class="breadcrumb">
+    <li>
+        <time class="published" datetime="2018-08-06T16:34:00+02:00">
+            06 août 2018
+        </time>
+    </li>
+    <li>Python</li>
+    <li>Data Visualization</li>
+</ol>
+</header>
+<div class='article_content'>
+<h1>Plotting in log axis with matplotlib</h1>
+<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
+<span class="o">%</span><span class="n">matplotlib</span> <span class="n">inline</span>
+
+
+<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
+
+<span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">linspace</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="mi">20</span><span class="p">)</span>
+<span class="n">y</span> <span class="o">=</span> <span class="mi">20</span><span class="o">*</span><span class="n">np</span><span class="o">.</span><span class="n">exp</span><span class="p">(</span><span class="o">-</span><span class="n">x</span><span class="o">/</span><span class="mf">10.0</span><span class="p">)</span>
+</pre></div>
+
+
+<h2>Plotting using the standard function then specifying the axis scale</h2>
+<p>One of the easiest way to plot in a log plot is to specify the plot normally and then specify which axis is to be plotted with a log scale.</p>
+<p>This can be specified by the function set_xscale or set_yscale</p>
+<div class="highlight"><pre><span></span><span class="c1"># Normal plot</span>
+<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
+<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
+
+<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
+</pre></div>
+
+
+<p><img alt="png" src="../images/Plotting+data+using+log+axis/output_6_0.png"></p>
+<div class="highlight"><pre><span></span><span class="c1"># Log x axis plot</span>
+<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
+<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">set_xscale</span><span class="p">(</span><span class="s1">&#39;log&#39;</span><span class="p">)</span>
+<span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
+
+<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
+</pre></div>
+
+
+<p><img alt="png" src="../images/Plotting+data+using+log+axis/output_7_0.png"></p>
+<div class="highlight"><pre><span></span><span class="c1"># Log x axis plot</span>
+<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
+<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">set_yscale</span><span class="p">(</span><span class="s1">&#39;log&#39;</span><span class="p">)</span>
+<span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
+
+<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
+</pre></div>
+
+
+<p><img alt="png" src="../images/Plotting+data+using+log+axis/output_8_0.png"></p>
+<div class="highlight"><pre><span></span><span class="c1"># Log x axis plot</span>
+<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
+<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">set_xscale</span><span class="p">(</span><span class="s1">&#39;log&#39;</span><span class="p">)</span>
+<span class="n">ax</span><span class="o">.</span><span class="n">set_yscale</span><span class="p">(</span><span class="s1">&#39;log&#39;</span><span class="p">)</span>
+<span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
+
+<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
+</pre></div>
+
+
+<p><img alt="png" src="../images/Plotting+data+using+log+axis/output_9_0.png"></p>
+<h2>Plotting using the matplotlib defined function</h2>
+<p>Matplotlib has the function : semilogx, semilogy and loglog that can help you avoid having to specify the axis scale.</p>
+<div class="highlight"><pre><span></span><span class="c1"># Plot using semilogx</span>
+<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
+<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">semilogx</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
+<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
+</pre></div>
+
+
+<p><img alt="png" src="../images/Plotting+data+using+log+axis/output_11_0.png"></p>
+<div class="highlight"><pre><span></span><span class="c1"># Plot using semilogy</span>
+<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
+<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">semilogy</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
+<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
+</pre></div>
+
+
+<p><img alt="png" src="../images/Plotting+data+using+log+axis/output_12_0.png"></p>
+<div class="highlight"><pre><span></span><span class="c1"># Plot using loglog</span>
+<span class="n">fig</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
+<span class="n">ax</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">add_subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">loglog</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">)</span>
+
+<span class="n">ax</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span>
+<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
+</pre></div>
+
+
+<p><img alt="png" src="../images/Plotting+data+using+log+axis/output_13_0.png"></p>
+</div>
+    <aside>
+    <div class="bug-reporting__panel">
+        <h3>Find an error or bug? Have a suggestion?</h3>
+        <p>Everything on this site is avaliable on GitHub. Head on over and <a href='https://github.com/redoules/redoules.github.io/issues/new'>submit an issue.</a> You can also message me directly by <a href='mailto:guillaume.redoules@gadz.org'>email</a>.</p>
+    </div>
+    </aside>
+</section>
+
+    </div>
+    <!-- start of footer section -->
+    <footer class="footer">
+        <div class="container">
+            <p class="text-muted">
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <br/>
+                Copyright &copy; Guillaume Redoulès,
+                    <time datetime="2018">2018</time>.
+                </center>
+            </p>
+        </div>
+    </footer>
+
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--- a/python/stock_pandas.html
+++ b/python/stock_pandas.html
@ -382,7 +382,7 @@
    <footer class="footer">
        <div class="container">
            <p class="text-muted">
-                <center>This project contains 23 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
                <br/>
                Copyright &copy; Guillaume Redoulès,
                    <time datetime="2018">2018</time>.
--- a/python/updating_all_python_package_with_anaconda.html
+++ b/python/updating_all_python_package_with_anaconda.html
@ -151,7 +151,7 @@
    <footer class="footer">
        <div class="container">
            <p class="text-muted">
-                <center>This project contains 23 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
                <br/>
                Copyright &copy; Guillaume Redoulès,
                    <time datetime="2018">2018</time>.
--- a/search.html
+++ b/search.html
@ -112,7 +112,7 @@
    <footer class="footer">
        <div class="container">
            <p class="text-muted">
-                <center>This project contains 23 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
                <br/>
                Copyright &copy; Guillaume Redoulès,
                    <time datetime="2018">2018</time>.
--- a/sitemap.xml
+++ b/sitemap.xml
@ -5,7 +5,7 @@ xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">

 <url>
 <loc>redoules.github.io/</loc>
-<lastmod>2018-08-05T10:53:43-00:00</lastmod>
+<lastmod>2018-08-06T16:49:52-00:00</lastmod>
 <changefreq>daily</changefreq>
 <priority>0.5</priority>
 </url>
@ -17,6 +17,13 @@ xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
 <priority>0.5</priority>
 </url>

+<url>
+<loc>redoules.github.io/python/logplot.html</loc>
+<lastmod>2018-08-06T16:34:00+02:00</lastmod>
+<changefreq>monthly</changefreq>
+<priority>0.5</priority>
+</url>
+
 <url>
 <loc>redoules.github.io/python/download_page.html</loc>
 <lastmod>2018-08-05T10:47:00+02:00</lastmod>
--- a/sql/Sorting_results.html
+++ b/sql/Sorting_results.html
@ -344,7 +344,7 @@ Done.
    <footer class="footer">
        <div class="container">
            <p class="text-muted">
-                <center>This project contains 23 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
                <br/>
                Copyright &copy; Guillaume Redoulès,
                    <time datetime="2018">2018</time>.
--- a/sql/WHERE_SQL_keywords.html
+++ b/sql/WHERE_SQL_keywords.html
@ -631,7 +631,7 @@ Done.
    <footer class="footer">
        <div class="container">
            <p class="text-muted">
-                <center>This project contains 23 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
                <br/>
                Copyright &copy; Guillaume Redoulès,
                    <time datetime="2018">2018</time>.
--- a/sql/display_table.html
+++ b/sql/display_table.html
@ -216,7 +216,7 @@ Done.
    <footer class="footer">
        <div class="container">
            <p class="text-muted">
-                <center>This project contains 23 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
                <br/>
                Copyright &copy; Guillaume Redoulès,
                    <time datetime="2018">2018</time>.
--- a/sql/display_table_filter.html
+++ b/sql/display_table_filter.html
@ -346,7 +346,7 @@ Done.
    <footer class="footer">
        <div class="container">
            <p class="text-muted">
-                <center>This project contains 23 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
+                <center>This project contains 24 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
                <br/>
                Copyright &copy; Guillaume Redoulès,
                    <time datetime="2018">2018</time>.
--- a/tipuesearch_content.json
+++ b/tipuesearch_content.json