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index.html
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"/>
<meta name="generator" content="distill" />
<link rel="alternate" type="application/rss+xml" href="https://david.frigge.nz/index.xml" />
<style type="text/css">
/* Hide doc at startup (prevent jankiness while JS renders/transforms) */
body {
visibility: hidden;
}
</style>
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<title>David's AdVentures In Data: Blog Posts by David Friggens</title>
<link rel="license" href="https://creativecommons.org/licenses/by/4.0/"/>
<!-- https://developers.facebook.com/docs/sharing/webmasters#markup -->
<meta property="og:title" content="David's AdVentures In Data: Blog Posts by David Friggens"/>
<meta property="og:type" content="article"/>
<meta property="og:locale" content="en_US"/>
<meta property="og:site_name" content="David's AdVentures In Data"/>
<!-- https://dev.twitter.com/cards/types/summary -->
<meta property="twitter:card" content="summary"/>
<meta property="twitter:title" content="David's AdVentures In Data: Blog Posts by David Friggens"/>
<meta property="twitter:site" content="@dakvid"/>
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{"type":"list","attributes":{"names":{"type":"character","attributes":{},"value":["title","site","listing"]}},"value":[{"type":"character","attributes":{},"value":["Blog Posts by David Friggens"]},{"type":"character","attributes":{},"value":["distill::distill_website"]},{"type":"character","attributes":{},"value":["posts"]}]}
</script>
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<script type="application/javascript">
window.headroom_prevent_pin = false;
window.document.addEventListener("DOMContentLoaded", function (event) {
// initialize headroom for banner
var header = $('header').get(0);
var headerHeight = header.offsetHeight;
var headroom = new Headroom(header, {
onPin : function() {
if (window.headroom_prevent_pin) {
window.headroom_prevent_pin = false;
headroom.unpin();
}
}
});
headroom.init();
if(window.location.hash)
headroom.unpin();
$(header).addClass('headroom--transition');
// offset scroll location for banner on hash change
// (see: https://github.com/WickyNilliams/headroom.js/issues/38)
window.addEventListener("hashchange", function(event) {
window.scrollTo(0, window.pageYOffset - (headerHeight + 25));
});
// responsive menu
$('.distill-site-header').each(function(i, val) {
var topnav = $(this);
var toggle = topnav.find('.nav-toggle');
toggle.on('click', function() {
topnav.toggleClass('responsive');
});
});
// nav dropdowns
$('.nav-dropbtn').click(function(e) {
$(this).next('.nav-dropdown-content').toggleClass('nav-dropdown-active');
$(this).parent().siblings('.nav-dropdown')
.children('.nav-dropdown-content').removeClass('nav-dropdown-active');
});
$("body").click(function(e){
$('.nav-dropdown-content').removeClass('nav-dropdown-active');
});
$(".nav-dropdown").click(function(e){
e.stopPropagation();
});
});
</script>
<style type="text/css">
/* Theme (user-documented overrideables for nav appearance) */
.distill-site-nav {
color: rgba(255, 255, 255, 0.8);
background-color: #455a64;
font-size: 15px;
font-weight: 300;
}
.distill-site-nav a {
color: inherit;
text-decoration: none;
}
.distill-site-nav a:hover {
color: white;
}
@media print {
.distill-site-nav {
display: none;
}
}
.distill-site-header {
}
.distill-site-footer {
}
/* Site Header */
.distill-site-header {
width: 100%;
box-sizing: border-box;
z-index: 3;
}
.distill-site-header .nav-left {
display: inline-block;
margin-left: 8px;
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@media screen and (max-width: 768px) {
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margin-left: 0;
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float: right;
margin-right: 8px;
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.distill-site-header a,
.distill-site-header .title {
display: inline-block;
text-align: center;
padding: 14px 10px 14px 10px;
}
.distill-site-header .title {
font-size: 18px;
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padding: 0;
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.distill-site-header .logo img {
display: none;
max-height: 20px;
width: auto;
margin-bottom: -4px;
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.distill-site-header .nav-image img {
max-height: 18px;
width: auto;
display: inline-block;
margin-bottom: -3px;
}
@media screen and (min-width: 1000px) {
.distill-site-header .logo img {
display: inline-block;
}
.distill-site-header .nav-left {
margin-left: 20px;
}
.distill-site-header .nav-right {
margin-right: 20px;
}
.distill-site-header .title {
padding-left: 12px;
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}
.distill-site-header .nav-toggle {
display: none;
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.nav-dropdown {
display: inline-block;
position: relative;
}
.nav-dropdown .nav-dropbtn {
border: none;
outline: none;
color: rgba(255, 255, 255, 0.8);
padding: 16px 10px;
background-color: transparent;
font-family: inherit;
font-size: inherit;
font-weight: inherit;
margin: 0;
margin-top: 1px;
z-index: 2;
}
.nav-dropdown-content {
display: none;
position: absolute;
background-color: white;
min-width: 200px;
border: 1px solid rgba(0,0,0,0.15);
border-radius: 4px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.1);
z-index: 1;
margin-top: 2px;
white-space: nowrap;
padding-top: 4px;
padding-bottom: 4px;
}
.nav-dropdown-content hr {
margin-top: 4px;
margin-bottom: 4px;
border: none;
border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}
.nav-dropdown-active {
display: block;
}
.nav-dropdown-content a, .nav-dropdown-content .nav-dropdown-header {
color: black;
padding: 6px 24px;
text-decoration: none;
display: block;
text-align: left;
}
.nav-dropdown-content .nav-dropdown-header {
display: block;
padding: 5px 24px;
padding-bottom: 0;
text-transform: uppercase;
font-size: 14px;
color: #999999;
white-space: nowrap;
}
.nav-dropdown:hover .nav-dropbtn {
color: white;
}
.nav-dropdown-content a:hover {
background-color: #ddd;
color: black;
}
.nav-right .nav-dropdown-content {
margin-left: -45%;
right: 0;
}
@media screen and (max-width: 768px) {
.distill-site-header a, .distill-site-header .nav-dropdown {display: none;}
.distill-site-header a.nav-toggle {
float: right;
display: block;
}
.distill-site-header .title {
margin-left: 0;
}
.distill-site-header .nav-right {
margin-right: 0;
}
.distill-site-header {
overflow: hidden;
}
.nav-right .nav-dropdown-content {
margin-left: 0;
}
}
@media screen and (max-width: 768px) {
.distill-site-header.responsive {position: relative;}
.distill-site-header.responsive a.nav-toggle {
position: absolute;
right: 0;
top: 0;
}
.distill-site-header.responsive a,
.distill-site-header.responsive .nav-dropdown {
display: block;
text-align: left;
}
.distill-site-header.responsive .nav-left,
.distill-site-header.responsive .nav-right {
width: 100%;
}
.distill-site-header.responsive .nav-dropdown {float: none;}
.distill-site-header.responsive .nav-dropdown-content {position: relative;}
.distill-site-header.responsive .nav-dropdown .nav-dropbtn {
display: block;
width: 100%;
text-align: left;
}
}
/* Site Footer */
.distill-site-footer {
width: 100%;
overflow: hidden;
box-sizing: border-box;
z-index: 3;
margin-top: 30px;
padding-top: 30px;
padding-bottom: 30px;
text-align: center;
}
/* Headroom */
d-title {
padding-top: 6rem;
}
@media print {
d-title {
padding-top: 4rem;
}
}
.headroom {
z-index: 1000;
position: fixed;
top: 0;
left: 0;
right: 0;
}
.headroom--transition {
transition: all .4s ease-in-out;
}
.headroom--unpinned {
top: -100px;
}
.headroom--pinned {
top: 0;
}
</style>
<link href="site_libs/font-awesome-5.1.0/css/all.css" rel="stylesheet"/>
<link href="site_libs/font-awesome-5.1.0/css/v4-shims.css" rel="stylesheet"/>
<script src="site_libs/headroom-0.9.4/headroom.min.js"></script>
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<!--radix_placeholder_distill-->
<style type="text/css">
body {
background-color: white;
}
.pandoc-table {
width: 100%;
}
.pandoc-table>caption {
margin-bottom: 10px;
}
.pandoc-table th:not([align]) {
text-align: left;
}
.pagedtable-footer {
font-size: 15px;
}
.html-widget {
margin-bottom: 2.0em;
}
.l-screen-inset {
padding-right: 16px;
}
.l-screen .caption {
margin-left: 10px;
}
.shaded {
background: rgb(247, 247, 247);
padding-top: 20px;
padding-bottom: 20px;
border-top: 1px solid rgba(0, 0, 0, 0.1);
border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}
.shaded .html-widget {
margin-bottom: 0;
border: 1px solid rgba(0, 0, 0, 0.1);
}
.shaded .shaded-content {
background: white;
}
.text-output {
margin-top: 0;
line-height: 1.5em;
}
.hidden {
display: none !important;
}
d-article {
padding-bottom: 30px;
}
d-appendix {
padding-top: 30px;
}
d-article>p>img {
width: 100%;
}
d-article iframe {
border: 1px solid rgba(0, 0, 0, 0.1);
margin-bottom: 2.0em;
width: 100%;
}
figure img.external {
background: white;
border: 1px solid rgba(0, 0, 0, 0.1);
box-shadow: 0 1px 8px rgba(0, 0, 0, 0.1);
padding: 18px;
box-sizing: border-box;
}
/* CSS for table of contents */
.d-toc {
color: rgba(0,0,0,0.8);
font-size: 0.8em;
line-height: 1em;
}
.d-toc-header {
font-size: 0.6rem;
font-weight: 400;
color: rgba(0, 0, 0, 0.5);
text-transform: uppercase;
margin-top: 0;
margin-bottom: 1.3em;
}
.d-toc a {
border-bottom: none;
}
.d-toc ul {
padding-left: 0;
}
.d-toc li>ul {
padding-top: 0.8em;
padding-left: 16px;
margin-bottom: 0.6em;
}
.d-toc ul,
.d-toc li {
list-style-type: none;
}
.d-toc li {
margin-bottom: 0.9em;
}
.d-toc-separator {
margin-top: 20px;
margin-bottom: 2em;
}
.d-article-with-toc {
border-top: none;
padding-top: 0;
}
/* Tweak code blocks (note that this CSS is repeated above in an injection
into the d-code shadow dom) */
d-code {
overflow-x: auto !important;
}
pre.d-code code.d-code {
padding-left: 10px;
font-size: 12px;
border-left: 2px solid rgba(0,0,0,0.1);
}
pre.text-output {
font-size: 12px;
color: black;
background: none;
font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
text-align: left;
white-space: pre;
word-spacing: normal;
word-break: normal;
word-wrap: normal;
line-height: 1.5;
-moz-tab-size: 4;
-o-tab-size: 4;
tab-size: 4;
-webkit-hyphens: none;
-moz-hyphens: none;
-ms-hyphens: none;
hyphens: none;
}
@media(min-width: 768px) {
d-code {
overflow-x: visible !important;
}
pre.d-code code.d-code {
padding-left: 18px;
font-size: 14px;
}
pre.text-output {
font-size: 14px;
}
}
/* Figure */
.figure {
position: relative;
margin-bottom: 2.5em;
margin-top: 1.5em;
}
.figure img {
width: 100%;
}
.figure .caption {
color: rgba(0, 0, 0, 0.6);
font-size: 12px;
line-height: 1.5em;
}
.figure img.external {
background: white;
border: 1px solid rgba(0, 0, 0, 0.1);
box-shadow: 0 1px 8px rgba(0, 0, 0, 0.1);
padding: 18px;
box-sizing: border-box;
}
.figure .caption a {
color: rgba(0, 0, 0, 0.6);
}
.figure .caption b,
.figure .caption strong, {
font-weight: 600;
color: rgba(0, 0, 0, 1.0);
}
/* Tweak 1000px media break to show more text */
@media(min-width: 1000px) {
.base-grid,
distill-header,
d-title,
d-abstract,
d-article,
d-appendix,
distill-appendix,
d-byline,
d-footnote-list,
d-citation-list,
distill-footer {
grid-template-columns: [screen-start] 1fr [page-start kicker-start] 80px [middle-start] 50px [text-start kicker-end] 65px 65px 65px 65px 65px 65px 65px 65px [text-end gutter-start] 65px [middle-end] 65px [page-end gutter-end] 1fr [screen-end];
grid-column-gap: 16px;
}
.grid {
grid-column-gap: 16px;
}
d-article {
font-size: 1.06rem;
line-height: 1.7em;
}
figure .caption, .figure .caption, figure figcaption {
font-size: 13px;
}
}
@media(min-width: 1180px) {
.base-grid,
distill-header,
d-title,
d-abstract,
d-article,
d-appendix,
distill-appendix,
d-byline,
d-footnote-list,
d-citation-list,
distill-footer {
grid-template-columns: [screen-start] 1fr [page-start kicker-start] 60px [middle-start] 60px [text-start kicker-end] 60px 60px 60px 60px 60px 60px 60px 60px [text-end gutter-start] 60px [middle-end] 60px [page-end gutter-end] 1fr [screen-end];
grid-column-gap: 32px;
}
.grid {
grid-column-gap: 32px;
}
}
/* Get the citation styles for the appendix (not auto-injected on render since
we do our own rendering of the citation appendix) */
d-appendix .citation-appendix,
.d-appendix .citation-appendix {
font-size: 11px;
line-height: 15px;
border-left: 1px solid rgba(0, 0, 0, 0.1);
padding-left: 18px;
border: 1px solid rgba(0,0,0,0.1);
background: rgba(0, 0, 0, 0.02);
padding: 10px 18px;
border-radius: 3px;
color: rgba(150, 150, 150, 1);
overflow: hidden;
margin-top: -12px;
white-space: pre-wrap;
word-wrap: break-word;
}
/* Social footer */
.social_footer {
margin-top: 30px;
margin-bottom: 0;
color: rgba(0,0,0,0.67);
}
.disqus-comments {
margin-right: 30px;
}
.disqus-comment-count {
border-bottom: 1px solid rgba(0, 0, 0, 0.4);
cursor: pointer;
}
#disqus_thread {
margin-top: 30px;
}
.article-sharing a {
border-bottom: none;
margin-right: 8px;
}
.article-sharing a:hover {
border-bottom: none;
}
.sidebar-section.subscribe {
font-size: 12px;
line-height: 1.6em;
}
.subscribe p {
margin-bottom: 0.5em;
}
.article-footer .subscribe {
font-size: 15px;
margin-top: 45px;
}
/* Improve display for browsers without grid (IE/Edge <= 15) */
.downlevel {
line-height: 1.6em;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
margin: 0;
}
.downlevel .d-title {
padding-top: 6rem;
padding-bottom: 1.5rem;
}
.downlevel .d-title h1 {
font-size: 50px;
font-weight: 700;
line-height: 1.1em;
margin: 0 0 0.5rem;
}
.downlevel .d-title p {
font-weight: 300;
font-size: 1.2rem;
line-height: 1.55em;
margin-top: 0;
}
.downlevel .d-byline {
padding-top: 0.8em;
padding-bottom: 0.8em;
font-size: 0.8rem;
line-height: 1.8em;
}
.downlevel .section-separator {
border: none;
border-top: 1px solid rgba(0, 0, 0, 0.1);
}
.downlevel .d-article {
font-size: 1.06rem;
line-height: 1.7em;
padding-top: 1rem;
padding-bottom: 2rem;
}
.downlevel .d-appendix {
padding-left: 0;
padding-right: 0;
max-width: none;
font-size: 0.8em;
line-height: 1.7em;
margin-bottom: 0;
color: rgba(0,0,0,0.5);
padding-top: 40px;
padding-bottom: 48px;
}
.downlevel .footnotes ol {
padding-left: 13px;
}
.downlevel .base-grid,
.downlevel .distill-header,
.downlevel .d-title,
.downlevel .d-abstract,
.downlevel .d-article,
.downlevel .d-appendix,
.downlevel .distill-appendix,
.downlevel .d-byline,
.downlevel .d-footnote-list,
.downlevel .d-citation-list,
.downlevel .distill-footer,
.downlevel .appendix-bottom,
.downlevel .posts-container {
padding-left: 40px;
padding-right: 40px;
}
@media(min-width: 768px) {
.downlevel .base-grid,
.downlevel .distill-header,
.downlevel .d-title,
.downlevel .d-abstract,
.downlevel .d-article,
.downlevel .d-appendix,
.downlevel .distill-appendix,
.downlevel .d-byline,
.downlevel .d-footnote-list,
.downlevel .d-citation-list,
.downlevel .distill-footer,
.downlevel .appendix-bottom,
.downlevel .posts-container {
padding-left: 150px;
padding-right: 150px;
max-width: 900px;
}
}
.downlevel pre code {
display: block;
border-left: 2px solid rgba(0, 0, 0, .1);
padding: 0 0 0 20px;
font-size: 14px;
}
.downlevel code, .downlevel pre {
color: black;
background: none;
font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
text-align: left;
white-space: pre;
word-spacing: normal;
word-break: normal;
word-wrap: normal;
line-height: 1.5;
-moz-tab-size: 4;
-o-tab-size: 4;
tab-size: 4;
-webkit-hyphens: none;
-moz-hyphens: none;
-ms-hyphens: none;
hyphens: none;
}
</style>
<script type="application/javascript">
function is_downlevel_browser() {
if (bowser.isUnsupportedBrowser({ msie: "12", msedge: "16"},
window.navigator.userAgent)) {
return true;
} else {
return window.load_distill_framework === undefined;
}
}
// show body when load is complete
function on_load_complete() {
// set body to visible
document.body.style.visibility = 'visible';
// force redraw for leaflet widgets
if (window.HTMLWidgets) {
var maps = window.HTMLWidgets.findAll(".leaflet");
$.each(maps, function(i, el) {
var map = this.getMap();
map.invalidateSize();
map.eachLayer(function(layer) {
if (layer instanceof L.TileLayer)
layer.redraw();
});
});
}
// trigger 'shown' so htmlwidgets resize
$('d-article').trigger('shown');
}
function init_distill() {
init_common();
// create front matter
var front_matter = $('<d-front-matter></d-front-matter>');
$('#distill-front-matter').wrap(front_matter);
// create d-title
$('.d-title').changeElementType('d-title');
// create d-byline
var byline = $('<d-byline></d-byline>');
$('.d-byline').replaceWith(byline);
// create d-article
var article = $('<d-article></d-article>');
$('.d-article').wrap(article).children().unwrap();
// move posts container into article
$('.posts-container').appendTo($('d-article'));
// create d-appendix
$('.d-appendix').changeElementType('d-appendix');
// create d-bibliography
var bibliography = $('<d-bibliography></d-bibliography>');
$('#distill-bibliography').wrap(bibliography);
// flag indicating that we have appendix items
var appendix = $('.appendix-bottom').children('h3').length > 0;
// replace citations with <d-cite>
$('.citation').each(function(i, val) {
appendix = true;
var cites = $(this).attr('data-cites').split(" ");
var dt_cite = $('<d-cite></d-cite>');
dt_cite.attr('key', cites.join());
$(this).replaceWith(dt_cite);
});
// remove refs
$('#refs').remove();
// replace footnotes with <d-footnote>
$('.footnote-ref').each(function(i, val) {
appendix = true;
var href = $(this).attr('href');
var id = href.replace('#', '');
var fn = $('#' + id);
var fn_p = $('#' + id + '>p');
fn_p.find('.footnote-back').remove();
var text = fn_p.html();
var dtfn = $('<d-footnote></d-footnote>');
dtfn.html(text);
$(this).replaceWith(dtfn);
});
// remove footnotes
$('.footnotes').remove();
$('h1.appendix, h2.appendix').each(function(i, val) {
$(this).changeElementType('h3');
});
$('h3.appendix').each(function(i, val) {
var id = $(this).attr('id');
$('.d-toc a[href="#' + id + '"]').parent().remove();
appendix = true;
$(this).nextUntil($('h1, h2, h3')).addBack().appendTo($('d-appendix'));
});
// show d-appendix if we have appendix content
$("d-appendix").css('display', appendix ? 'grid' : 'none');
// replace code blocks with d-code
$('pre>code').each(function(i, val) {
var code = $(this);
var pre = code.parent();
var clz = "";
var language = pre.attr('class');
if (language) {
// map unknown languages to "clike" (without this they just dissapear)
if ($.inArray(language, ["bash", "clike", "css", "go", "html",
"javascript", "js", "julia", "lua", "markdown",
"markup", "mathml", "python", "svg", "xml"]) == -1)
language = "clike";
language = ' language="' + language + '"';
var dt_code = $('<d-code block' + language + clz + '></d-code>');
dt_code.text(code.text());
pre.replaceWith(dt_code);
} else {
code.addClass('text-output').unwrap().changeElementType('pre');
}
});
// localize layout chunks to just output
$('.layout-chunk').each(function(i, val) {
// capture layout
var layout = $(this).attr('data-layout');
// apply layout to markdown level block elements
var elements = $(this).children().not('d-code, pre.text-output, script');
elements.each(function(i, el) {