487 lines
15 KiB
HTML
487 lines
15 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="generator" content="pandoc" />
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<meta http-equiv="X-UA-Compatible" content="IE=EDGE" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Custom knitr language engines</title>
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<script>// Pandoc 2.9 adds attributes on both header and div. We remove the former (to
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// be compatible with the behavior of Pandoc < 2.8).
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document.addEventListener('DOMContentLoaded', function(e) {
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var hs = document.querySelectorAll("div.section[class*='level'] > :first-child");
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var i, h, a;
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for (i = 0; i < hs.length; i++) {
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h = hs[i];
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if (!/^h[1-6]$/i.test(h.tagName)) continue; // it should be a header h1-h6
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a = h.attributes;
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while (a.length > 0) h.removeAttribute(a[0].name);
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}
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});
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</script>
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<style type="text/css">
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code{white-space: pre-wrap;}
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span.smallcaps{font-variant: small-caps;}
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span.underline{text-decoration: underline;}
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div.column{display: inline-block; vertical-align: top; width: 50%;}
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div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
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ul.task-list{list-style: none;}
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</style>
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<style type="text/css">
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code {
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white-space: pre;
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}
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.sourceCode {
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overflow: visible;
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}
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</style>
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<style type="text/css" data-origin="pandoc">
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pre > code.sourceCode { white-space: pre; position: relative; }
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pre > code.sourceCode > span { line-height: 1.25; }
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pre > code.sourceCode > span:empty { height: 1.2em; }
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.sourceCode { overflow: visible; }
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code.sourceCode > span { color: inherit; text-decoration: inherit; }
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div.sourceCode { margin: 1em 0; }
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pre.sourceCode { margin: 0; }
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@media screen {
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div.sourceCode { overflow: auto; }
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}
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@media print {
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pre > code.sourceCode { white-space: pre-wrap; }
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pre > code.sourceCode > span { display: inline-block; text-indent: -5em; padding-left: 5em; }
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}
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pre.numberSource code
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{ counter-reset: source-line 0; }
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pre.numberSource code > span
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{ position: relative; left: -4em; counter-increment: source-line; }
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pre.numberSource code > span > a:first-child::before
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{ content: counter(source-line);
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position: relative; left: -1em; text-align: right; vertical-align: baseline;
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border: none; display: inline-block;
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-webkit-touch-callout: none; -webkit-user-select: none;
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-khtml-user-select: none; -moz-user-select: none;
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-ms-user-select: none; user-select: none;
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padding: 0 4px; width: 4em;
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color: #aaaaaa;
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}
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pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa; padding-left: 4px; }
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div.sourceCode
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{ }
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@media screen {
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pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
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}
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code span.al { color: #ff0000; font-weight: bold; }
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code span.an { color: #60a0b0; font-weight: bold; font-style: italic; }
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code span.at { color: #7d9029; }
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code span.bn { color: #40a070; }
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code span.bu { color: #008000; }
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code span.cf { color: #007020; font-weight: bold; }
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code span.ch { color: #4070a0; }
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code span.cn { color: #880000; }
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code span.co { color: #60a0b0; font-style: italic; }
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code span.cv { color: #60a0b0; font-weight: bold; font-style: italic; }
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code span.do { color: #ba2121; font-style: italic; }
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code span.dt { color: #902000; }
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code span.dv { color: #40a070; }
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code span.er { color: #ff0000; font-weight: bold; }
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code span.ex { }
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code span.fl { color: #40a070; }
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code span.fu { color: #06287e; }
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code span.im { color: #008000; font-weight: bold; }
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code span.in { color: #60a0b0; font-weight: bold; font-style: italic; }
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code span.kw { color: #007020; font-weight: bold; }
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code span.op { color: #666666; }
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code span.ot { color: #007020; }
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code span.pp { color: #bc7a00; }
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code span.sc { color: #4070a0; }
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code span.ss { color: #bb6688; }
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code span.st { color: #4070a0; }
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code span.va { color: #19177c; }
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code span.vs { color: #4070a0; }
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code span.wa { color: #60a0b0; font-weight: bold; font-style: italic; }
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</style>
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<script>
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// apply pandoc div.sourceCode style to pre.sourceCode instead
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(function() {
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var sheets = document.styleSheets;
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for (var i = 0; i < sheets.length; i++) {
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if (sheets[i].ownerNode.dataset["origin"] !== "pandoc") continue;
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try { var rules = sheets[i].cssRules; } catch (e) { continue; }
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var j = 0;
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while (j < rules.length) {
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var rule = rules[j];
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// check if there is a div.sourceCode rule
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if (rule.type !== rule.STYLE_RULE || rule.selectorText !== "div.sourceCode") {
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j++;
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continue;
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}
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var style = rule.style.cssText;
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// check if color or background-color is set
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if (rule.style.color === '' && rule.style.backgroundColor === '') {
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j++;
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continue;
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}
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// replace div.sourceCode by a pre.sourceCode rule
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sheets[i].deleteRule(j);
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sheets[i].insertRule('pre.sourceCode{' + style + '}', j);
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}
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}
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})();
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</script>
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<style type="text/css">body {
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background-color: #fff;
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margin: 1em auto;
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max-width: 700px;
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overflow: visible;
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padding-left: 2em;
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padding-right: 2em;
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font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
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font-size: 14px;
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line-height: 1.35;
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}
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#TOC {
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clear: both;
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margin: 0 0 10px 10px;
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padding: 4px;
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width: 400px;
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border: 1px solid #CCCCCC;
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border-radius: 5px;
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background-color: #f6f6f6;
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font-size: 13px;
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line-height: 1.3;
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}
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#TOC .toctitle {
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font-weight: bold;
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font-size: 15px;
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margin-left: 5px;
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}
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#TOC ul {
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padding-left: 40px;
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margin-left: -1.5em;
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margin-top: 5px;
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margin-bottom: 5px;
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}
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#TOC ul ul {
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margin-left: -2em;
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}
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#TOC li {
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line-height: 16px;
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}
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table {
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margin: 1em auto;
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border-width: 1px;
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border-color: #DDDDDD;
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border-style: outset;
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border-collapse: collapse;
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}
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table th {
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border-width: 2px;
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padding: 5px;
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border-style: inset;
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}
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table td {
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border-width: 1px;
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border-style: inset;
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line-height: 18px;
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padding: 5px 5px;
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}
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table, table th, table td {
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border-left-style: none;
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border-right-style: none;
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}
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table thead, table tr.even {
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background-color: #f7f7f7;
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}
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p {
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margin: 0.5em 0;
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}
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blockquote {
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background-color: #f6f6f6;
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padding: 0.25em 0.75em;
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}
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hr {
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border-style: solid;
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border: none;
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border-top: 1px solid #777;
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margin: 28px 0;
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}
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dl {
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margin-left: 0;
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}
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dl dd {
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margin-bottom: 13px;
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margin-left: 13px;
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}
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dl dt {
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font-weight: bold;
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}
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ul {
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margin-top: 0;
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}
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ul li {
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list-style: circle outside;
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}
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ul ul {
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margin-bottom: 0;
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}
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pre, code {
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background-color: #f7f7f7;
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border-radius: 3px;
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color: #333;
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white-space: pre-wrap;
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}
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pre {
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border-radius: 3px;
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margin: 5px 0px 10px 0px;
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padding: 10px;
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}
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pre:not([class]) {
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background-color: #f7f7f7;
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}
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code {
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font-family: Consolas, Monaco, 'Courier New', monospace;
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font-size: 85%;
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}
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p > code, li > code {
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padding: 2px 0px;
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}
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div.figure {
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text-align: center;
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}
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img {
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background-color: #FFFFFF;
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padding: 2px;
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border: 1px solid #DDDDDD;
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border-radius: 3px;
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border: 1px solid #CCCCCC;
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margin: 0 5px;
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}
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h1 {
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margin-top: 0;
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font-size: 35px;
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line-height: 40px;
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}
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h2 {
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border-bottom: 4px solid #f7f7f7;
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padding-top: 10px;
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padding-bottom: 2px;
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font-size: 145%;
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}
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h3 {
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border-bottom: 2px solid #f7f7f7;
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padding-top: 10px;
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font-size: 120%;
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}
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h4 {
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border-bottom: 1px solid #f7f7f7;
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margin-left: 8px;
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font-size: 105%;
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}
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h5, h6 {
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border-bottom: 1px solid #ccc;
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font-size: 105%;
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}
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a {
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color: #0033dd;
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text-decoration: none;
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}
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a:hover {
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color: #6666ff; }
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a:visited {
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color: #800080; }
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a:visited:hover {
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color: #BB00BB; }
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a[href^="http:"] {
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text-decoration: underline; }
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a[href^="https:"] {
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text-decoration: underline; }
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code > span.kw { color: #555; font-weight: bold; }
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code > span.dt { color: #902000; }
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code > span.dv { color: #40a070; }
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code > span.bn { color: #d14; }
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code > span.fl { color: #d14; }
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code > span.ch { color: #d14; }
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code > span.st { color: #d14; }
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code > span.co { color: #888888; font-style: italic; }
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code > span.ot { color: #007020; }
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code > span.al { color: #ff0000; font-weight: bold; }
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code > span.fu { color: #900; font-weight: bold; }
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code > span.er { color: #a61717; background-color: #e3d2d2; }
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</style>
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</head>
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<body>
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<h1 class="title toc-ignore">Custom knitr language engines</h1>
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<p>Glue provides a few <a href="https://bookdown.org/yihui/rmarkdown-cookbook/custom-engine.html#custom-engine">custom
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language engines</a> for knitr, which allows you to use glue directly in
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knitr chunks.</p>
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<div id="glue-engine" class="section level2">
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<h2><code>glue</code> engine</h2>
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<p>The first engine is the <code>glue</code> engine, which evaluates the
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chunk contents as a glue template.</p>
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<pre class="glue"><code>1 + 1 = {1 + 1}</code></pre>
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<pre><code>## 1 + 1 = 2</code></pre>
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<p>Maybe the most useful use of the <code>glue</code> engine is to set
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the knitr option <code>results = 'asis'</code> and output markdown or
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HTML directly into the document.</p>
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<div class="sourceCode" id="cb3"><pre class="sourceCode markdown"><code class="sourceCode markdown"><span id="cb3-1"><a href="#cb3-1" tabindex="-1"></a><span class="in">```{glue, results = 'asis', echo = FALSE}</span></span>
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<span id="cb3-2"><a href="#cb3-2" tabindex="-1"></a><span class="in">#### mtcars has **{nrow(mtcars)} rows** and _{ncol(mtcars)} columns_.</span></span>
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<span id="cb3-3"><a href="#cb3-3" tabindex="-1"></a><span class="in">```</span></span></code></pre></div>
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<div id="mtcars-has-32-rows-and-11-columns." class="section level4">
|
||
|
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<h4>mtcars has <strong>32 rows</strong> and <em>11 columns</em>.</h4>
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<p>If you want to pass additional arguments into the glue call, simply
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include them as chunk options.</p>
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|
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<div class="sourceCode" id="cb4"><pre class="sourceCode markdown"><code class="sourceCode markdown"><span id="cb4-1"><a href="#cb4-1" tabindex="-1"></a><span class="in">```{glue, .open = "<<", .close = ">>", results = 'asis', echo = FALSE}</span></span>
|
||
|
|
<span id="cb4-2"><a href="#cb4-2" tabindex="-1"></a><span class="in">The **median waiting time** between eruptions is <<median(faithful$waiting)>>.</span></span>
|
||
|
|
<span id="cb4-3"><a href="#cb4-3" tabindex="-1"></a><span class="in">```</span></span></code></pre></div>
|
||
|
|
<p>The <strong>median waiting time</strong> between eruptions is 76.</p>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div id="glue_sql-engine" class="section level2">
|
||
|
|
<h2><code>glue_sql</code> engine</h2>
|
||
|
|
<p>The second engine is <code>glue_sql</code>, which will use
|
||
|
|
<code>glue::glue_sql()</code> to generate a SQL query and then run the
|
||
|
|
query using the <a href="https://bookdown.org/yihui/rmarkdown/language-engines.html#sql">sql
|
||
|
|
engine</a>.</p>
|
||
|
|
<p>First we create a new connection to an in-memory SQLite database, and
|
||
|
|
write a new table to it.</p>
|
||
|
|
<div class="sourceCode" id="cb5"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb5-1"><a href="#cb5-1" tabindex="-1"></a>con <span class="ot"><-</span> DBI<span class="sc">::</span><span class="fu">dbConnect</span>(RSQLite<span class="sc">::</span><span class="fu">SQLite</span>(), <span class="st">":memory:"</span>)</span>
|
||
|
|
<span id="cb5-2"><a href="#cb5-2" tabindex="-1"></a>mtcars<span class="sc">$</span>model <span class="ot"><-</span> <span class="fu">rownames</span>(mtcars)</span>
|
||
|
|
<span id="cb5-3"><a href="#cb5-3" tabindex="-1"></a>DBI<span class="sc">::</span><span class="fu">dbWriteTable</span>(con, <span class="st">"mtcars"</span>, mtcars)</span></code></pre></div>
|
||
|
|
<p>Next define some variables we that we can use with glue to
|
||
|
|
interpolate.</p>
|
||
|
|
<div class="sourceCode" id="cb6"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1" tabindex="-1"></a>var <span class="ot"><-</span> <span class="st">"mpg"</span></span>
|
||
|
|
<span id="cb6-2"><a href="#cb6-2" tabindex="-1"></a>tbl <span class="ot"><-</span> <span class="st">"mtcars"</span></span>
|
||
|
|
<span id="cb6-3"><a href="#cb6-3" tabindex="-1"></a>num <span class="ot"><-</span> <span class="dv">150</span></span></code></pre></div>
|
||
|
|
<p>Then we can use <code>glue_sql</code> to construct and run a query
|
||
|
|
using those variables into that database. <em>Note</em> you need to
|
||
|
|
provide the connection object as a <code>connection</code> chunk
|
||
|
|
option.</p>
|
||
|
|
<p>In this example there are two type of quotes. The first is a bare
|
||
|
|
backtick, these are passed directly to the SQL engine unchanged. The
|
||
|
|
second is backticks inside of braces, which are specially interpreted to
|
||
|
|
do the proper quoting for the given SQL engine by glue. In this example
|
||
|
|
we use the <code>sqlite</code> engine, which uses backticks for quoting,
|
||
|
|
but you would use the same backticks inside brace syntax for postgreSQL,
|
||
|
|
and <code>glue_sql()</code> would automatically use double quotes for
|
||
|
|
quoting instead.</p>
|
||
|
|
<div class="sourceCode" id="cb7"><pre class="sourceCode markdown"><code class="sourceCode markdown"><span id="cb7-1"><a href="#cb7-1" tabindex="-1"></a><span class="in">```{glue_sql, connection = con}</span></span>
|
||
|
|
<span id="cb7-2"><a href="#cb7-2" tabindex="-1"></a><span class="in">SELECT `model`, `hp`, {`var`}</span></span>
|
||
|
|
<span id="cb7-3"><a href="#cb7-3" tabindex="-1"></a><span class="in">FROM {`tbl`}</span></span>
|
||
|
|
<span id="cb7-4"><a href="#cb7-4" tabindex="-1"></a><span class="in">WHERE {`tbl`}.`hp` > {num}</span></span>
|
||
|
|
<span id="cb7-5"><a href="#cb7-5" tabindex="-1"></a><span class="in">```</span></span></code></pre></div>
|
||
|
|
<div class="sourceCode" id="cb8"><pre class="sourceCode sql"><code class="sourceCode sql"><span id="cb8-1"><a href="#cb8-1" tabindex="-1"></a><span class="kw">SELECT</span> `model`, `hp`, `mpg`</span>
|
||
|
|
<span id="cb8-2"><a href="#cb8-2" tabindex="-1"></a><span class="kw">FROM</span> `mtcars`</span>
|
||
|
|
<span id="cb8-3"><a href="#cb8-3" tabindex="-1"></a><span class="kw">WHERE</span> `mtcars`.`hp` <span class="op">></span> <span class="dv">150</span></span></code></pre></div>
|
||
|
|
<div class="knitsql-table">
|
||
|
|
<table>
|
||
|
|
<caption>Displaying records 1 - 10</caption>
|
||
|
|
<thead>
|
||
|
|
<tr class="header">
|
||
|
|
<th align="left">model</th>
|
||
|
|
<th align="right">hp</th>
|
||
|
|
<th align="right">mpg</th>
|
||
|
|
</tr>
|
||
|
|
</thead>
|
||
|
|
<tbody>
|
||
|
|
<tr class="odd">
|
||
|
|
<td align="left">Hornet Sportabout</td>
|
||
|
|
<td align="right">175</td>
|
||
|
|
<td align="right">18.7</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="even">
|
||
|
|
<td align="left">Duster 360</td>
|
||
|
|
<td align="right">245</td>
|
||
|
|
<td align="right">14.3</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="odd">
|
||
|
|
<td align="left">Merc 450SE</td>
|
||
|
|
<td align="right">180</td>
|
||
|
|
<td align="right">16.4</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="even">
|
||
|
|
<td align="left">Merc 450SL</td>
|
||
|
|
<td align="right">180</td>
|
||
|
|
<td align="right">17.3</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="odd">
|
||
|
|
<td align="left">Merc 450SLC</td>
|
||
|
|
<td align="right">180</td>
|
||
|
|
<td align="right">15.2</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="even">
|
||
|
|
<td align="left">Cadillac Fleetwood</td>
|
||
|
|
<td align="right">205</td>
|
||
|
|
<td align="right">10.4</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="odd">
|
||
|
|
<td align="left">Lincoln Continental</td>
|
||
|
|
<td align="right">215</td>
|
||
|
|
<td align="right">10.4</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="even">
|
||
|
|
<td align="left">Chrysler Imperial</td>
|
||
|
|
<td align="right">230</td>
|
||
|
|
<td align="right">14.7</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="odd">
|
||
|
|
<td align="left">Camaro Z28</td>
|
||
|
|
<td align="right">245</td>
|
||
|
|
<td align="right">13.3</td>
|
||
|
|
</tr>
|
||
|
|
<tr class="even">
|
||
|
|
<td align="left">Pontiac Firebird</td>
|
||
|
|
<td align="right">175</td>
|
||
|
|
<td align="right">19.2</td>
|
||
|
|
</tr>
|
||
|
|
</tbody>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
<!-- code folding -->
|
||
|
|
|
||
|
|
|
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|
|
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|
||
|
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<script>
|
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var script = document.createElement("script");
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</html>
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