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  <blog_title>とりあえず日記</blog_title>
  <blog_url>https://ohtorii.hatenadiary.jp/</blog_url>
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    <anon>数学</anon>
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  <description>wxMaxima version /* quaternion qmul(quaternion l, quaternion r); */ qmul(l,r) := [ l[1]*r[4] + l[4]*r[1] + l[2]*r[3] - l[3]*r[2] , l[2]*r[4] + l[4]*r[2] + l[3]*r[1] - l[1]*r[3] , l[3]*r[4] + l[4]*r[3] + l[1]*r[2] - l[2]*r[1] , l[4]*r[4] - l[1]*r[1] - l[2]*r[2] - l[3]*r[3] ]; q1:[x,y,z,w]; q2:[0,0,0,…</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2015-03-24 00:00:00</published>
  <title>wxMaximaでクォータニオンの積を計算する。</title>
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  <url>https://ohtorii.hatenadiary.jp/entry/20150324/p1</url>
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