numpy.asmatrix.html

<h1><span class="yiyi-st" id="yiyi-12">numpy.asmatrix</span></h1>
        <blockquote>
        <p>原文：<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.asmatrix.html">https://docs.scipy.org/doc/numpy/reference/generated/numpy.asmatrix.html</a></p>
        <p>译者：<a href="https://github.com/wizardforcel">飞龙</a> <a href="http://usyiyi.cn/">UsyiyiCN</a></p>
        <p>校对：（虚位以待）</p>
        </blockquote>
    
<dl class="function">
<dt id="numpy.asmatrix"><span class="yiyi-st" id="yiyi-13"> <code class="descclassname">numpy.</code><code class="descname">asmatrix</code><span class="sig-paren">(</span><em>data</em>, <em>dtype=None</em><span class="sig-paren">)</span><a class="reference external" href="http://github.com/numpy/numpy/blob/v1.11.3/numpy/matrixlib/defmatrix.py#L66-L98"><span class="viewcode-link">[source]</span></a></span></dt>
<dd><p><span class="yiyi-st" id="yiyi-14">将输入解释为矩阵。</span></p>
<p><span class="yiyi-st" id="yiyi-15">与<a class="reference internal" href="numpy.matrix.html#numpy.matrix" title="numpy.matrix"><code class="xref py py-obj docutils literal"><span class="pre">matrix</span></code></a>不同，如果输入已经是矩阵或者ndarray，则<a class="reference internal" href="#numpy.asmatrix" title="numpy.asmatrix"><code class="xref py py-obj docutils literal"><span class="pre">asmatrix</span></code></a>不会进行复制。</span><span class="yiyi-st" id="yiyi-16">等同于<code class="docutils literal"><span class="pre">矩阵（数据，</span> <span class="pre">copy = False）</span></code>。</span></p>
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<tr class="field-odd field"><th class="field-name"><span class="yiyi-st" id="yiyi-17">参数：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-18"><strong>data</strong>：array_like</span></p>
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<div><p><span class="yiyi-st" id="yiyi-19">输入数据。</span></p>
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<p><span class="yiyi-st" id="yiyi-20"><strong>dtype</strong>：数据类型</span></p>
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<div><p><span class="yiyi-st" id="yiyi-21">输出矩阵的数据类型。</span></p>
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<tr class="field-even field"><th class="field-name"><span class="yiyi-st" id="yiyi-22">返回：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-23"><strong>mat</strong>：matrix</span></p>
<blockquote class="last">
<div><p><span class="yiyi-st" id="yiyi-24"><em class="xref py py-obj">数据</em>解释为矩阵。</span></p>
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<p class="rubric"><span class="yiyi-st" id="yiyi-25">例子</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</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">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">]])</span>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">m</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="n">x</span><span class="p">)</span>
</pre></div>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">x</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="mi">5</span>
</pre></div>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">m</span>
<span class="go">matrix([[5, 2],</span>
<span class="go">        [3, 4]])</span>
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