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<section id="numpy-bmat">
<h1>numpy.bmat<a class="headerlink" href="#numpy-bmat" title="Link to this heading">#</a></h1>
<dl class="py function">
<dt class="sig sig-object py" id="numpy.bmat">
<span class="sig-prename descclassname"><span class="pre">numpy.</span></span><span class="sig-name descname"><span class="pre">bmat</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">obj</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">ldict</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">gdict</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="reference external" href="https://github.com/numpy/numpy/blob/main/numpy/matrixlib/defmatrix.py#L1041-L1118"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#numpy.bmat" title="Link to this definition">#</a></dt>
<dd><p>Build a matrix object from a string, nested sequence, or array.</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>obj</strong><span class="classifier">str or array_like</span></dt><dd><p>Input data. If a string, variables in the current scope may be
referenced by name.</p>
</dd>
<dt><strong>ldict</strong><span class="classifier">dict, optional</span></dt><dd><p>A dictionary that replaces local operands in current frame.
Ignored if <em class="xref py py-obj">obj</em> is not a string or <em class="xref py py-obj">gdict</em> is None.</p>
</dd>
<dt><strong>gdict</strong><span class="classifier">dict, optional</span></dt><dd><p>A dictionary that replaces global operands in current frame.
Ignored if <em class="xref py py-obj">obj</em> is not a string.</p>
</dd>
</dl>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><dl class="simple">
<dt><strong>out</strong><span class="classifier">matrix</span></dt><dd><p>Returns a matrix object, which is a specialized 2-D array.</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.block.html#numpy.block" title="numpy.block"><code class="xref py py-obj docutils literal notranslate"><span class="pre">block</span></code></a></dt><dd><p>A generalization of this function for N-d arrays, that returns normal ndarrays.</p>
</dd>
</dl>
</div>
<p class="rubric">Examples</p>
<div class="try_examples_outer_container docutils container" id="40e92583-f62d-4dab-86ed-606fa8cf75dd">
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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">A</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">asmatrix</span><span class="p">(</span><span class="s1">'1 1; 1 1'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">B</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">asmatrix</span><span class="p">(</span><span class="s1">'2 2; 2 2'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">C</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">asmatrix</span><span class="p">(</span><span class="s1">'3 4; 5 6'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">D</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">asmatrix</span><span class="p">(</span><span class="s1">'7 8; 9 0'</span><span class="p">)</span>
</pre></div>
</div>
<p>All the following expressions construct the same block matrix:</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">bmat</span><span class="p">([[</span><span class="n">A</span><span class="p">,</span> <span class="n">B</span><span class="p">],</span> <span class="p">[</span><span class="n">C</span><span class="p">,</span> <span class="n">D</span><span class="p">]])</span>
<span class="go">matrix([[1, 1, 2, 2],</span>
<span class="go"> [1, 1, 2, 2],</span>
<span class="go"> [3, 4, 7, 8],</span>
<span class="go"> [5, 6, 9, 0]])</span>
<span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">bmat</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">r_</span><span class="p">[</span><span class="n">np</span><span class="o">.</span><span class="n">c_</span><span class="p">[</span><span class="n">A</span><span class="p">,</span> <span class="n">B</span><span class="p">],</span> <span class="n">np</span><span class="o">.</span><span class="n">c_</span><span class="p">[</span><span class="n">C</span><span class="p">,</span> <span class="n">D</span><span class="p">]])</span>
<span class="go">matrix([[1, 1, 2, 2],</span>
<span class="go"> [1, 1, 2, 2],</span>
<span class="go"> [3, 4, 7, 8],</span>
<span class="go"> [5, 6, 9, 0]])</span>
<span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">bmat</span><span class="p">(</span><span class="s1">'A,B; C,D'</span><span class="p">)</span>
<span class="go">matrix([[1, 1, 2, 2],</span>
<span class="go"> [1, 1, 2, 2],</span>
<span class="go"> [3, 4, 7, 8],</span>
<span class="go"> [5, 6, 9, 0]])</span>
</pre></div>
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