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    <title>计量经济学 on 博客于文</title>
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      <title>对矩阵求导</title>
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      <description>&lt;p&gt;考虑到很多常见问题的目标函数都是仿射或二次型形式的，若其为凸函数，梯度为0的点即为最优解。因此，在最小二乘等问题中常要对矩阵求导。&lt;/p&gt;</description>
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