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  <author_name>namaza</author_name>
  <author_url>https://blog.hatena.ne.jp/namaza/</author_url>
  <blog_title>雑記</blog_title>
  <blog_url>https://ytrewq.hatenablog.com/</blog_url>
  <categories>
    <anon>機械学習</anon>
  </categories>
  <description>*と.*では異なる。 *は行列として積をとる。 [1 2; 3 4; 5 6] * [2 ; 2] = [ 1*2 + 2*2 ; 3*2 + 4*2 ; 5*2 + 6*2] = [6; 14 ; 22] octave:13&gt; xx = 1 2 3 4 5 6 octave:14&gt; yy = 2 2 octave:15&gt; x * yans = 6 14 22 .*は要素ごと。 [1 2; 3 4; 5 6] .* [ 0 0 ; 1 1 ; 2 2 ] = [ 0 0 ; 3 4; 10 12] octave:25&gt; xx = 1 2 3 4 5 6 octave:26&gt; yy = 0 0 …</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2017-07-29 20:11:08</published>
  <title>octaveの行列の積</title>
  <type>rich</type>
  <url>https://ytrewq.hatenablog.com/entry/2017/07/29/201108</url>
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