要找到2个向量之间的差异 - 提到的答案之一是：
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Chosen: A jQuery Plugin by Harvest to Tame Unwieldy Select Boxes</title>
<link rel="stylesheet" href="docsupport/style.css">
<link rel="stylesheet" href="docsupport/prism.css">
<link rel="stylesheet" href="chosen.css">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' https://ajax.googleapis.com; style-src 'self'; img-src 'self' data:">
</head>
<body>
<form>
<div id="container">
<div id="content">
<div class="side-by-side clearfix">
</div>
<div class="side-by-side clearfix">
<div>
<em>Into This</em>
<select data-placeholder="Choose a Country..." class="chosen-select" multiple tabindex="4">
<option value=""></option>
<option value="United States">United States</option>
<option value="United Kingdom">United Kingdom</option>
<option value="Western Sahara">Western Sahara</option>
<option value="Yemen">Yemen</option>
<option value="Zambia">Zambia</option>
<option value="Zimbabwe">Zimbabwe</option>
</select>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.js" type="text/javascript"></script>
<script src="chosen.jquery.js" type="text/javascript"></script>
<script src="docsupport/prism.js" type="text/javascript" charset="utf-8"></script>
<script src="docsupport/init.js" type="text/javascript" charset="utf-8"></script>
</form>
</body>
</html>
x[is.na(match(x,y))]。
有人可以详细解释这个答案吗？
答案 0 :(得分：0)
将其分解为步骤，
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