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<section id="numpy-atleast-3d">
<h1>numpy.atleast_3d<a class="headerlink" href="#numpy-atleast-3d" title="Link to this heading">#</a></h1>
<dl class="py function">
<dt class="sig sig-object py" id="numpy.atleast_3d">
<span class="sig-prename descclassname"><span class="pre">numpy.</span></span><span class="sig-name descname"><span class="pre">atleast_3d</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">arys</span></span></em><span class="sig-paren">)</span><a class="reference external" href="https://github.com/numpy/numpy/blob/main/numpy/_core/shape_base.py#L139-L205"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#numpy.atleast_3d" title="Link to this definition">#</a></dt>
<dd><p>View inputs as arrays with at least three dimensions.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><dl class="simple">
<dt><strong>arys1, arys2, …</strong><span class="classifier">array_like</span></dt><dd><p>One or more array-like sequences. Non-array inputs are converted to
arrays. Arrays that already have three or more dimensions are
preserved.</p>
</dd>
</dl>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><dl class="simple">
<dt><strong>res1, res2, …</strong><span class="classifier">ndarray</span></dt><dd><p>An array, or tuple of arrays, each with <code class="docutils literal notranslate"><span class="pre">a.ndim</span> <span class="pre">>=</span> <span class="pre">3</span></code>. Copies are
avoided where possible, and views with three or more dimensions are
returned. For example, a 1-D array of shape <code class="docutils literal notranslate"><span class="pre">(N,)</span></code> becomes a view
of shape <code class="docutils literal notranslate"><span class="pre">(1,</span> <span class="pre">N,</span> <span class="pre">1)</span></code>, and a 2-D array of shape <code class="docutils literal notranslate"><span class="pre">(M,</span> <span class="pre">N)</span></code> becomes a
view of shape <code class="docutils literal notranslate"><span class="pre">(M,</span> <span class="pre">N,</span> <span class="pre">1)</span></code>.</p>
</dd>
</dl>
</dd>
</dl>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<dl class="simple">
<dt><a class="reference internal" href="numpy.atleast_1d.html#numpy.atleast_1d" title="numpy.atleast_1d"><code class="xref py py-obj docutils literal notranslate"><span class="pre">atleast_1d</span></code></a>, <a class="reference internal" href="numpy.atleast_2d.html#numpy.atleast_2d" title="numpy.atleast_2d"><code class="xref py py-obj docutils literal notranslate"><span class="pre">atleast_2d</span></code></a></dt><dd></dd>
</dl>
</div>
<p class="rubric">Examples</p>
<div class="try_examples_outer_container docutils container" id="9464c40f-0851-443b-8695-5123105d719c">
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<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span><span class="w"> </span><span class="nn">numpy</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">np</span>
<span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">atleast_3d</span><span class="p">(</span><span class="mf">3.0</span><span class="p">)</span>
<span class="go">array([[[3.]]])</span>
</pre></div>
</div>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mf">3.0</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">atleast_3d</span><span class="p">(</span><span class="n">x</span><span class="p">)</span><span class="o">.</span><span class="n">shape</span>
<span class="go">(1, 3, 1)</span>
</pre></div>
</div>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mf">12.0</span><span class="p">)</span><span class="o">.</span><span class="n">reshape</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">atleast_3d</span><span class="p">(</span><span class="n">x</span><span class="p">)</span><span class="o">.</span><span class="n">shape</span>
<span class="go">(4, 3, 1)</span>
<span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">atleast_3d</span><span class="p">(</span><span class="n">x</span><span class="p">)</span><span class="o">.</span><span class="n">base</span> <span class="ow">is</span> <span class="n">x</span><span class="o">.</span><span class="n">base</span> <span class="c1"># x is a reshape, so not base itself</span>
<span class="go">True</span>
</pre></div>
</div>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="k">for</span> <span class="n">arr</span> <span class="ow">in</span> <span class="n">np</span><span class="o">.</span><span class="n">atleast_3d</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">],</span> <span class="p">[[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">]],</span> <span class="p">[[[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">]]]):</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="n">arr</span><span class="p">,</span> <span class="n">arr</span><span class="o">.</span><span class="n">shape</span><span class="p">)</span>
<span class="gp">...</span>
<span class="go">[[[1]</span>
<span class="go"> [2]]] (1, 2, 1)</span>
<span class="go">[[[1]</span>
<span class="go"> [2]]] (1, 2, 1)</span>
<span class="go">[[[1 2]]] (1, 1, 2)</span>
</pre></div>
</div>
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