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<div class="section" id="math-abs">
<h1><span class="section-number">7.15.13. </span><code class="docutils literal notranslate"><span class="pre">math_abs</span></code><a class="headerlink" href="#math-abs" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.15.13.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 7.0.4.</span></p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">math_abs</span></code> returns the absolute value of value.</p>
<p>To enable this function, register <code class="docutils literal notranslate"><span class="pre">functions/math</span></code> plugin by following the command:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>plugin_register functions/math
</pre></div>
</div>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.15.13.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">math_abs</span></code> requires one argument - <code class="docutils literal notranslate"><span class="pre">target</span></code>.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>math_abs(target)
</pre></div>
</div>
</div>
<div class="section" id="usage">
<h2><span class="section-number">7.15.13.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Here is a schema definition and sample data.</p>
<p>Sample schema:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Shops TABLE_HASH_KEY ShortText
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Shops from_station COLUMN_SCALAR Int32
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Shops from_office COLUMN_SCALAR Int32
# [[0, 1337566253.89858, 0.000355720520019531], true]
</pre></div>
</div>
<p>Sample data:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>load --table Shops
[
{"_key": "Coffee Shop", "from_station": 50},
{"_key": "Donut & Coffee Shop", "from_station": 400},
{"_key": "Cake & Coffee Shop", "from_station": 200}
]
# [[0, 1337566253.89858, 0.000355720520019531], 3]
</pre></div>
</div>
<p>Here is the simple usage of <code class="docutils literal notranslate"><span class="pre">math_abs</span></code> function which returns nearest shops from office.</p>
<p>To detect nearest shops, we need to calculate distance.
If the distance of your office from station is 250 meters, you can calculate it by <code class="docutils literal notranslate"><span class="pre">math_abs(250</span> <span class="pre">-</span> <span class="pre">from_station)</span></code>.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>select Shops --filter true --output_columns '_key, from_office' --scorer 'from_office = math_abs(250 - from_station)' --sort_keys from_office
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 3
# ],
# [
# [
# "_key",
# "ShortText"
# ],
# [
# "from_office",
# "Int32"
# ]
# ],
# [
# "Cake & Coffee Shop",
# 50
# ],
# [
# "Donut & Coffee Shop",
# 150
# ],
# [
# "Coffee Shop",
# 200
# ]
# ]
# ]
# ]
</pre></div>
</div>
<p>By specifying <code class="docutils literal notranslate"><span class="pre">--sort_keys</span> <span class="pre">from_office</span></code>, you can show nearest shops by ascending order.</p>
</div>
<div class="section" id="parameters">
<h2><span class="section-number">7.15.13.4. </span>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<p>There is only one required parameter.</p>
<div class="section" id="target">
<h3><span class="section-number">7.15.13.4.1. </span><code class="docutils literal notranslate"><span class="pre">target</span></code><a class="headerlink" href="#target" title="Permalink to this headline">¶</a></h3>
<p>Specifies a column of table that is specified by <code class="docutils literal notranslate"><span class="pre">table</span></code> parameter in <code class="docutils literal notranslate"><span class="pre">select</span></code>.</p>
</div>
</div>
<div class="section" id="return-value">
<h2><span class="section-number">7.15.13.5. </span>Return value<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">math_abs</span></code> returns the absolute value of target column value.</p>
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<li><a class="reference internal" href="#">7.15.13. <code class="docutils literal notranslate"><span class="pre">math_abs</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.15.13.1. Summary</a></li>
<li><a class="reference internal" href="#syntax">7.15.13.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.15.13.3. Usage</a></li>
<li><a class="reference internal" href="#parameters">7.15.13.4. Parameters</a><ul>
<li><a class="reference internal" href="#target">7.15.13.4.1. <code class="docutils literal notranslate"><span class="pre">target</span></code></a></li>
</ul>
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<li><a class="reference internal" href="#return-value">7.15.13.5. Return value</a></li>
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