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  <author_name>ryamada</author_name>
  <author_url>https://blog.hatena.ne.jp/ryamada/</author_url>
  <blog_title>ryamadaのコンピュータ・数学メモ</blog_title>
  <blog_url>https://ryamada.hatenadiary.jp/</blog_url>
  <categories>
    <anon>幾何学</anon>
    <anon>曲線</anon>
    <anon>三角関数</anon>
    <anon>積分</anon>
  </categories>
  <description>参考記事 L.sin &lt;- function(a,b,x0=0,x1=2*pi,N=100000){ x &lt;- seq(from=x0,to=x1,length=N) x &lt;- x[-N] sum(sqrt(1+a^2*b^2*cos(b*x)^2)) * (x1-x0)/(N-1) } L.sin(1,1) as &lt;- seq(from=0,to=20,length=50) Ls &lt;- rep(0,length(as)) for(i in 1:length(as)){ Ls[i] &lt;- L.sin(as[i],1) } plot(as,Ls) bs &lt;- 0:10 Ls &lt;- rep(0,l…</description>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2013-08-12 05:58:33</published>
  <title>サインカーブの長さ</title>
  <type>rich</type>
  <url>https://ryamada.hatenadiary.jp/entry/20130812/1376168313</url>
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