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| <section id="logarithmic-functions"> |
| <h1>Logarithmic Functions<a class="headerlink" href="#logarithmic-functions" title="Permalink to this heading"></a></h1> |
| <section id="e"> |
| <h2>e<a class="headerlink" href="#e" title="Permalink to this heading"></a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">e()</span></code> returns the base of the natural logarithm, e.</p> |
| <p>Syntax: <code class="docutils literal notranslate"><span class="pre">e()</span></code></p> |
| <p>Returns:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">An</span> <span class="n">agtype</span> <span class="nb">float</span><span class="o">.</span> |
| </pre></div> |
| </div> |
| <p>Query</p> |
| <div class="highlight-postgresql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span> |
| <span class="k">FROM</span><span class="w"> </span><span class="n">cypher</span><span class="p">(</span><span class="s1">'graph_name'</span><span class="p">,</span><span class="w"> </span><span class="s">$$</span> |
| <span class="s"> RETURN e()</span> |
| <span class="s">$$</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="p">(</span><span class="n">e</span><span class="w"> </span><span class="n">agtype</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>Results</p> |
| <table> |
| <tr> |
| <td>e |
| </td> |
| </tr> |
| <tr> |
| <td> 2.71828182845905 |
| </td> |
| </tr> |
| <tr> |
| <td>1 row(s) returned |
| </td> |
| </tr> |
| </table> |
| </section> |
| <section id="sqrt"> |
| <h2>sqrt<a class="headerlink" href="#sqrt" title="Permalink to this heading"></a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">sqrt()</span></code> returns the square root of a number.</p> |
| <p>Syntax: <code class="docutils literal notranslate"><span class="pre">sqrt(expression)</span></code></p> |
| <p>Returns:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">An</span> <span class="n">agtype</span> <span class="nb">float</span><span class="o">.</span> |
| </pre></div> |
| </div> |
| <p>Query</p> |
| <div class="highlight-postgresql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span> |
| <span class="k">FROM</span><span class="w"> </span><span class="n">cypher</span><span class="p">(</span><span class="s1">'graph_name'</span><span class="p">,</span><span class="w"> </span><span class="s">$$</span> |
| <span class="s"> RETURN sqrt(144)</span> |
| <span class="s">$$</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="p">(</span><span class="n">results</span><span class="w"> </span><span class="n">agtype</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>Results</p> |
| <table> |
| <tr> |
| <td>results |
| </td> |
| </tr> |
| <tr> |
| <td>12 |
| </td> |
| </tr> |
| <tr> |
| <td>1 row(s) returned |
| </td> |
| </tr> |
| </table> |
| </section> |
| <section id="exp"> |
| <h2>exp<a class="headerlink" href="#exp" title="Permalink to this heading"></a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">exp()</span></code> returns e^n, where e is the base of the natural logarithm, and n is the value of the argument expression.</p> |
| <p>Syntax: <code class="docutils literal notranslate"><span class="pre">exp(expression)</span></code></p> |
| <p>Returns:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">An</span> <span class="n">agtype</span> <span class="nb">float</span><span class="o">.</span> |
| </pre></div> |
| </div> |
| <p>Arguments:</p> |
| <table> |
| <tr> |
| <td>Name |
| </td> |
| <td>Description |
| </td> |
| </tr> |
| <tr> |
| <td>expression |
| </td> |
| <td>An agtype number expression |
| </td> |
| </tr> |
| </table> |
| <p>Considerations:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">exp(null)</span></code> returns <code class="docutils literal notranslate"><span class="pre">null</span></code>.</p></li> |
| </ul> |
| <p>Query:</p> |
| <div class="highlight-postgresql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span> |
| <span class="k">FROM</span><span class="w"> </span><span class="n">cypher</span><span class="p">(</span><span class="s1">'graph_name'</span><span class="p">,</span><span class="w"> </span><span class="s">$$</span> |
| <span class="s"> RETURN exp(2)</span> |
| <span class="s">$$</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="p">(</span><span class="n">e</span><span class="w"> </span><span class="n">agtype</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>e to the power of 2 is returned.</p> |
| <p>Result:</p> |
| <table> |
| <tr> |
| <td>e |
| </td> |
| </tr> |
| <tr> |
| <td>7.38905609893065 |
| </td> |
| </tr> |
| <tr> |
| <td>1 row(s) returned |
| </td> |
| </tr> |
| </table> |
| </section> |
| <section id="log"> |
| <h2>log<a class="headerlink" href="#log" title="Permalink to this heading"></a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">log()</span></code> returns the natural logarithm of a number.</p> |
| <p>Syntax: <code class="docutils literal notranslate"><span class="pre">log(expression)</span></code></p> |
| <p>Returns:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">An</span> <span class="n">agtype</span> <span class="nb">float</span><span class="o">.</span> |
| </pre></div> |
| </div> |
| <p>Arguments:</p> |
| <table> |
| <tr> |
| <td>Name |
| </td> |
| <td>Description |
| </td> |
| </tr> |
| <tr> |
| <td>expression |
| </td> |
| <td>An agtype number expression |
| </td> |
| </tr> |
| </table> |
| <p>Considerations:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">log(null)</span></code> returns <code class="docutils literal notranslate"><span class="pre">null</span></code>.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">log(0)</span></code> returns <code class="docutils literal notranslate"><span class="pre">null</span></code>.</p></li> |
| </ul> |
| <p>Query:</p> |
| <div class="highlight-postgresql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span> |
| <span class="k">FROM</span><span class="w"> </span><span class="n">cypher</span><span class="p">(</span><span class="s1">'graph_name'</span><span class="p">,</span><span class="w"> </span><span class="s">$$</span> |
| <span class="s"> RETURN log(27)</span> |
| <span class="s">$$</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="p">(</span><span class="n">natural_logarithm</span><span class="w"> </span><span class="n">agtype</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>The natural logarithm of 27 is returned.</p> |
| <p>Result:</p> |
| <table> |
| <tr> |
| <td>natural_logarithm |
| </td> |
| </tr> |
| <tr> |
| <td>3.295836866004329 |
| </td> |
| </tr> |
| <tr> |
| <td>1 row(s) returned |
| </td> |
| </tr> |
| </table> |
| </section> |
| <section id="log10"> |
| <h2>log10<a class="headerlink" href="#log10" title="Permalink to this heading"></a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">log10()</span></code> returns the common logarithm (base 10) of a number.</p> |
| <p>Syntax: <code class="docutils literal notranslate"><span class="pre">log10(expression)</span></code></p> |
| <p>Returns:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">An</span> <span class="n">agtype</span> <span class="nb">float</span><span class="o">.</span> |
| </pre></div> |
| </div> |
| <p>Arguments:</p> |
| <table> |
| <tr> |
| <td>Name |
| </td> |
| <td>Description |
| </td> |
| </tr> |
| <tr> |
| <td>expression |
| </td> |
| <td>An agtype number expression |
| </td> |
| </tr> |
| </table> |
| <p>Considerations:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">log10(null)</span></code> returns <code class="docutils literal notranslate"><span class="pre">null</span></code>.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">log10(0)</span></code> returns <code class="docutils literal notranslate"><span class="pre">null</span></code>.</p></li> |
| </ul> |
| <p>Query:</p> |
| <div class="highlight-postgresql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span> |
| <span class="k">FROM</span><span class="w"> </span><span class="n">cypher</span><span class="p">(</span><span class="s1">'graph_name'</span><span class="p">,</span><span class="w"> </span><span class="s">$$</span> |
| <span class="s"> RETURN log10(27)</span> |
| <span class="s">$$</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="p">(</span><span class="n">common_logarithm</span><span class="w"> </span><span class="n">agtype</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>The common logarithm of 27 is returned.</p> |
| <p>Result:</p> |
| <table> |
| <tr> |
| <td>common_logarithm |
| </td> |
| </tr> |
| <tr> |
| <td>1.4313637641589874 |
| </td> |
| </tr> |
| <tr> |
| <td>1 row(s) returned |
| </td> |
| </tr> |
| </table> |
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