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ch4_exercise.html
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="pandoc" />
<meta name="author" content="Yao-Jen Kuo" />
<meta name="date" content="2017-01-16" />
<title>基本資料結構 - 隨堂練習</title>
<script src="ch4_exercise_files/jquery-1.11.3/jquery.min.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1" />
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<script src="ch4_exercise_files/bootstrap-3.3.5/shim/respond.min.js"></script>
<script src="ch4_exercise_files/navigation-1.1/tabsets.js"></script>
<link href="ch4_exercise_files/highlightjs-1.1/default.css" rel="stylesheet" />
<script src="ch4_exercise_files/highlightjs-1.1/highlight.js"></script>
<style type="text/css">code{white-space: pre;}</style>
<style type="text/css">
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background-color: white;
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</style>
<script type="text/javascript">
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</script>
<style type="text/css">
h1 {
font-size: 34px;
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h1.title {
font-size: 38px;
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h2 {
font-size: 30px;
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h3 {
font-size: 24px;
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h4 {
font-size: 18px;
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font-size: 16px;
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h6 {
font-size: 12px;
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.table th:not([align]) {
text-align: left;
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</style>
</head>
<body>
<style type = "text/css">
.main-container {
max-width: 940px;
margin-left: auto;
margin-right: auto;
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code {
color: inherit;
background-color: rgba(0, 0, 0, 0.04);
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img {
max-width:100%;
height: auto;
}
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padding-top: 12px;
}
button.code-folding-btn:focus {
outline: none;
}
</style>
<div class="container-fluid main-container">
<!-- tabsets -->
<script>
$(document).ready(function () {
window.buildTabsets("TOC");
});
</script>
<!-- code folding -->
<div class="fluid-row" id="header">
<h1 class="title toc-ignore">基本資料結構 - 隨堂練習</h1>
<h4 class="author"><em>Yao-Jen Kuo</em></h4>
<h4 class="date"><em>2017-01-16</em></h4>
</div>
<script src="https://cdn.datacamp.com/datacamp-light-latest.min.js"></script>
<div class="section level2">
<h2>草帽海賊團的年紀向量</h2>
<p>我們已經預先幫你建好一個向量 <code>age</code> 紀錄草帽海賊團成員的年紀，利用邏輯值向量找出海賊團成員中未滿 25 歲的人數總和。</p>
<div data-datacamp-exercise="" data-height="300" data-encoded="true">
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</div>
</div>
<div class="section level2">
<h2>草帽海賊團的資料框</h2>
<p>我們已經預先幫你建好一個資料框 <code>one_piece_df</code> 紀錄草帽海賊團成員的姓名，年紀與性別。</p>
<div data-datacamp-exercise="" data-height="300" data-encoded="true">
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