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    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><a href="/docs/4.1.0/" aria-current="page" class="sidebar-link">Chart.js</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Getting Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>General</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Configuration</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/4.1.0/configuration/" aria-current="page" class="sidebar-link">Configuration</a></li><li><a href="/docs/4.1.0/configuration/animations.html" class="sidebar-link">Animations</a></li><li><a href="/docs/4.1.0/configuration/canvas-background.html" class="sidebar-link">Canvas background</a></li><li><a href="/docs/4.1.0/configuration/decimation.html" aria-current="page" class="active sidebar-link">Data Decimation</a></li><li><a href="/docs/4.1.0/configuration/device-pixel-ratio.html" class="sidebar-link">Device Pixel Ratio</a></li><li><a href="/docs/4.1.0/configuration/elements.html" class="sidebar-link">Elements</a></li><li><a href="/docs/4.1.0/configuration/interactions.html" class="sidebar-link">Interactions</a></li><li><a href="/docs/4.1.0/configuration/layout.html" class="sidebar-link">Layout</a></li><li><a href="/docs/4.1.0/configuration/legend.html" class="sidebar-link">Legend</a></li><li><a href="/docs/4.1.0/configuration/locale.html" class="sidebar-link">Locale</a></li><li><a href="/docs/4.1.0/configuration/responsive.html" class="sidebar-link">Responsive Charts</a></li><li><a href="/docs/4.1.0/configuration/subtitle.html" class="sidebar-link">Subtitle</a></li><li><a href="/docs/4.1.0/configuration/title.html" class="sidebar-link">Title</a></li><li><a href="/docs/4.1.0/configuration/tooltip.html" class="sidebar-link">Tooltip</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Chart Types</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Axes</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Developers</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Migration</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="data-decimation"><a href="#data-decimation" class="header-anchor">#</a> Data Decimation</h1> <p>The decimation plugin can be used with line charts to automatically decimate data at the start of the chart lifecycle. Before enabling this plugin, review the <a href="#requirements">requirements</a> to ensure that it will work with the chart you want to create.</p> <h2 id="configuration-options"><a href="#configuration-options" class="header-anchor">#</a> Configuration Options</h2> <p>Namespace: <code>options.plugins.decimation</code>, the global options for the plugin are defined in <code>Chart.defaults.plugins.decimation</code>.</p> <table><thead><tr><th>Name</th> <th>Type</th> <th>Default</th> <th>Description</th></tr></thead> <tbody><tr><td><code>enabled</code></td> <td><code>boolean</code></td> <td><code>false</code></td> <td>Is decimation enabled?</td></tr> <tr><td><code>algorithm</code></td> <td><code>string</code></td> <td><code>'min-max'</code></td> <td>Decimation algorithm to use. See the <a href="#decimation-algorithms">more...</a></td></tr> <tr><td><code>samples</code></td> <td><code>number</code></td> <td></td> <td>If the <code>'lttb'</code> algorithm is used, this is the number of samples in the output dataset. Defaults to the canvas width to pick 1 sample per pixel.</td></tr> <tr><td><code>threshold</code></td> <td><code>number</code></td> <td></td> <td>If the number of samples in the current axis range is above this value, the decimation will be triggered. Defaults to 4 times the canvas width.<br>The number of point after decimation can be higher than the <code>threshold</code> value.</td></tr></tbody></table> <h2 id="decimation-algorithms"><a href="#decimation-algorithms" class="header-anchor">#</a> Decimation Algorithms</h2> <p>Decimation algorithm to use for data. Options are:</p> <ul><li><code>'lttb'</code></li> <li><code>'min-max'</code></li></ul> <h3 id="largest-triangle-three-bucket-lttb-decimation"><a href="#largest-triangle-three-bucket-lttb-decimation" class="header-anchor">#</a> Largest Triangle Three Bucket (LTTB) Decimation</h3> <p><a href="https://github.com/sveinn-steinarsson/flot-downsample" target="_blank" rel="noopener noreferrer">LTTB<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> decimation reduces the number of data points significantly. This is most useful for showing trends in data using only a few data points.</p> <h3 id="min-max-decimation"><a href="#min-max-decimation" class="header-anchor">#</a> Min/Max Decimation</h3> <p><a href="https://digital.ni.com/public.nsf/allkb/F694FFEEA0ACF282862576020075F784" target="_blank" rel="noopener noreferrer">Min/max<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> decimation will preserve peaks in your data but could require up to 4 points for each pixel. This type of decimation would work well for a very noisy signal where you need to see data peaks.</p> <h2 id="requirements"><a href="#requirements" class="header-anchor">#</a> Requirements</h2> <p>To use the decimation plugin, the following requirements must be met:</p> <ol><li>The dataset must have an <a href="/docs/4.1.0/charts/line.html#general"><code>indexAxis</code></a> of <code>'x'</code></li> <li>The dataset must be a line</li> <li>The X axis for the dataset must be either a <a href="/docs/4.1.0/axes/cartesian/linear.html"><code>'linear'</code></a> or <a href="/docs/4.1.0/axes/cartesian/time.html"><code>'time'</code></a> type axis</li> <li>Data must not need parsing, i.e. <a href="/docs/4.1.0/general/data-structures.html#dataset-configuration"><code>parsing</code></a> must be <code>false</code></li> <li>The dataset object must be mutable. The plugin stores the original data as <code>dataset._data</code> and then defines a new <code>data</code> property on the dataset.</li> <li>There must be more points on the chart than the threshold value. Take a look at the Configuration Options for more information.</li></ol> <h2 id="related-samples"><a href="#related-samples" class="header-anchor">#</a> Related Samples</h2> <ul><li><a href="../samples/advanced/data-decimation">Data Decimation Sample</a></li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">12/16/2022, 6:36:14 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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