blog/content/post/2008-09-27-00001038.md

---
title: 自分でmaxを定義してみる
author: kazu634
date: 2008-09-27
url: /2008/09/27/_1115/
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categories:
  - gauche
  - Lisp

---
<div class="section">
<p>
    もしや
</p>

<pre class="syntax-highlight">
<span class="synSpecial">(</span>define <span class="synSpecial">(</span>my_max<span class="synStatement"> . </span>lis<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">null</span>? lis<span class="synSpecial">)</span> #f]
[<span class="synSpecial">(</span><span class="synStatement">=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">1</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">2</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">&#60;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span>]<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">3</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">&#60;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span>my_max <span class="synSpecial">(</span><span class="synStatement">cons</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cddr</span> lis<span class="synSpecial">)))</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span>my_max <span class="synSpecial">(</span><span class="synStatement">cons</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cddr</span> lis<span class="synSpecial">)))</span>]<span class="synSpecial">)</span>]<span class="synSpecial">))</span>
gosh&#62; <span class="synSpecial">(</span>my_max <span class="synConstant">1</span> <span class="synConstant">2</span> <span class="synConstant">3</span> <span class="synConstant">4</span> <span class="synConstant">5</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synConstant">2</span> <span class="synConstant">3</span> <span class="synConstant">4</span> <span class="synConstant">5</span><span class="synSpecial">)</span>
</pre>

<p>
    になるのは、consすると二回目のmy_maxの引数の数が1だと思われているから？ちょっとがんばってみよう。
</p>

<blockquote>
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</blockquote>

<p>
    追記:
</p>

<pre class="syntax-highlight">
<span class="synSpecial">(</span>define <span class="synSpecial">(</span>my_max<span class="synStatement"> . </span>lis<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">null</span>? lis<span class="synSpecial">)</span> #f]
[<span class="synSpecial">(</span><span class="synStatement">=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">1</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">2</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">&#60;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span>]<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">3</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">&#60;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">car</span> <span class="synSpecial">(</span><span class="synStatement">cons</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cddr</span> lis<span class="synSpecial">)))</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">car</span> <span class="synSpecial">(</span><span class="synStatement">cons</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cddr</span> lis<span class="synSpecial">)))</span>]<span class="synSpecial">)</span>]<span class="synSpecial">))</span>
gosh&#62; <span class="synSpecial">(</span>my_max <span class="synConstant">1</span> <span class="synConstant">2</span> <span class="synConstant">3</span> <span class="synConstant">4</span> <span class="synConstant">5</span><span class="synSpecial">)</span>
<span class="synConstant">2</span>
</pre>

<p>
    となるから自分の勘違いかな？
</p>

<p>
    追記の追記:
</p>

<pre class="syntax-highlight">
<span class="synSpecial">(</span>define <span class="synSpecial">(</span>my_max<span class="synStatement"> . </span>lis<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">null</span>? #?=lis<span class="synSpecial">)</span> #f]
[<span class="synSpecial">(</span><span class="synStatement">=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">1</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">2</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">&#60;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span>]<span class="synSpecial">)</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span>my_length lis<span class="synSpecial">)</span> <span class="synConstant">3</span><span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cond</span> [<span class="synSpecial">(</span><span class="synStatement">&#60;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span>my_max <span class="synSpecial">(</span><span class="synStatement">cons</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cddr</span> lis<span class="synSpecial">)))</span>]
[<span class="synSpecial">(</span><span class="synStatement">&#62;=</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cadr</span> lis<span class="synSpecial">))</span> <span class="synSpecial">(</span>my_max <span class="synSpecial">(</span><span class="synStatement">cons</span> <span class="synSpecial">(</span><span class="synStatement">car</span> lis<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">cddr</span> lis<span class="synSpecial">)))</span>]<span class="synSpecial">)</span>]<span class="synSpecial">))</span>
gosh&#62; <span class="synSpecial">(</span>my_max <span class="synConstant">1</span> <span class="synConstant">2</span> <span class="synConstant">3</span> <span class="synConstant">4</span> <span class="synConstant">5</span><span class="synSpecial">)</span>
#?=lis
#?<span class="synStatement">-</span>    <span class="synSpecial">(</span><span class="synConstant">1</span> <span class="synConstant">2</span> <span class="synConstant">3</span> <span class="synConstant">4</span> <span class="synConstant">5</span><span class="synSpecial">)</span>
#?=lis
#?<span class="synStatement">-</span>    <span class="synSpecial">((</span><span class="synConstant">2</span> <span class="synConstant">3</span> <span class="synConstant">4</span> <span class="synConstant">5</span><span class="synSpecial">))</span>
<span class="synSpecial">(</span><span class="synConstant">2</span> <span class="synConstant">3</span> <span class="synConstant">4</span> <span class="synConstant">5</span><span class="synSpecial">)</span>
</pre>

<p>
    いや、勘違いじゃなかったぞ！
</p>
</div>