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<a href="Lesson1.html">Lesson 1</a>
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<a href="Lesson3.html">Lesson 3</a>
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</ul>
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<p> </p>
<!-- install packages -->
<!-- ____________________________________________________________________________ -->
<!-- ____________________________________________________________________________ -->
<!-- ____________________________________________________________________________ -->
<!-- start body -->
<div id="lesson-7-import-diverse-data-files-and-structures" class="section level1">
<h1>Lesson 7: Import diverse data files and structures</h1>
<p> </p>
<p>Functions for Lesson 7<br />
<code>read_csv</code>, <code>read_delim</code>, <code>write_csv</code><br />
</p>
<p>Packages for Lesson 7<br />
<code>readr</code><br />
</p>
</div>
<div id="agenda" class="section level1">
<h1>Agenda</h1>
<p>Use the <code>readr</code> package to easily read in different data file types.</p>
<p><a href="https://readr.tidyverse.org/">Cheat sheet for the <code>readr</code> package</a>.<br />
</p>
<!-- ----------------------- image --------------------------- -->
<div align="center">
<p><img src="img/readr.png" style=width:50%></p>
</div>
<!-- ----------------------- image --------------------------- -->
<p> </p>
<!-- end yaml template------------------------------------------------------- -->
</div>
<div id="do-first" class="section level1">
<h1>Do First</h1>
<p>Recreate the below PDF using <code>RMarkdown</code> with the following conditions from the smaller NYC Airbnb dataset. <a href="https://raw.githubusercontent.com/darwinanddavis/EmoRyCodingClub/master/Lesson7_dofirst.pdf">Download the final PDF file here</a>.</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r"><span class="co"># smaller csv file (16 cols)</span>
url <-<span class="st"> "http://data.insideairbnb.com/united-states/ny/new-york-city/2021-04-07/data/listings.csv.gz"</span>
nyc <-<span class="st"> </span>readr<span class="op">::</span><span class="kw">read_csv</span>(url)
nyc <-<span class="st"> </span>nyc[nyc<span class="op">$</span>id <span class="op"><</span><span class="st"> </span><span class="fl">1e+06</span>, ] <span class="co"># get smaller subet of data</span></code></pre></div>
<ul>
<li>Accommodation less than $200 per night, between 5 and 15 nights, and excluding Staten Island.<br />
</li>
<li>Show only the data structure of the above subsetted data as a code output. No need to show the code for how you subsetted the data (see the PDF).<br />
</li>
<li>Show the plotting code along with the plot.<br />
</li>
<li>Use the below <code>yaml</code> for your <code>Rmd</code> file.</li>
</ul>
<div class="sourceCode"><pre class="sourceCode yaml"><code class="sourceCode yaml">
<span class="ot">---</span>
<span class="fu">title:</span><span class="at"> </span><span class="st">"Dissecting property availability in New York City using Airbnb open data"</span>
<span class="fu">author:</span><span class="at"> </span><span class="st">"<your name here>"</span>
<span class="fu">urlcolor:</span><span class="at"> blue</span>
<span class="fu">params:</span>
<span class="fu">source:</span><span class="at"> </span><span class="st">"http://insideairbnb.com/new-york-city/"</span>
<span class="fu">output:</span>
<span class="fu">pdf_document:</span>
<span class="fu">toc:</span><span class="at"> yes</span>
<span class="fu">toc_depth:</span><span class="at"> 2</span>
<span class="ot">---</span>
</code></pre></div>
<ul>
<li>Append the below code at the beginning of your <code>Rmd</code> file to load the appropriate packages and suppress the package loading messages and warnings. Use a <code>{r, echo=T, eval=T, message=F}</code> header in the code chunk.</li>
</ul>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r">pacman<span class="op">::</span><span class="kw">p_load</span>(ggthemes, ggplot2, readr, dplyr)</code></pre></div>
<!-- ----------------------- image --------------------------- -->
<p><img src="img/lesson7_dofirst1.jpg" /> <img src="img/lesson7_dofirst2.jpg" /> <!-- ----------------------- image --------------------------- --> </p>
<hr />
</div>
<div id="reading-in-different-data-file-types" class="section level1">
<h1>Reading in different data file types</h1>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r"><span class="kw">read_csv</span>(<span class="st">"file.csv"</span>) <span class="co"># read in csv </span>
<span class="kw">read_csv2</span>(<span class="st">"file2.csv"</span>) <span class="co"># read in csv data for ';' as separator and ',' as decimal point</span>
<span class="kw">read_delim</span>(<span class="st">"file.txt"</span>, <span class="dt">delim =</span> <span class="st">"|"</span>) <span class="co"># read flat txt files and specify the delimiter </span>
<span class="kw">read_tsv</span>(<span class="st">"file.tsv"</span>) <span class="co"># read flat data separated by tabs </span>
<span class="kw">read_table</span>() <span class="co"># read data separated by white space, i.e. a table </span>
<span class="kw">write_file</span>(<span class="dt">x =</span> <span class="st">"a,b,c</span><span class="ch">\n</span><span class="st">1,2,3</span><span class="ch">\n</span><span class="st">4,5,NA"</span>, <span class="dt">path =</span> <span class="st">"file.csv"</span>)
<span class="kw">write_file</span>(<span class="dt">x =</span> <span class="st">"a;b;c</span><span class="ch">\n</span><span class="st">1;2;3</span><span class="ch">\n</span><span class="st">4;5;NA"</span>, <span class="dt">path =</span> <span class="st">"file2.csv"</span>)
<span class="kw">write_file</span>(<span class="dt">x =</span> <span class="st">"a|b|c</span><span class="ch">\n</span><span class="st">1|2|3</span><span class="ch">\n</span><span class="st">4|5|NA"</span>, <span class="dt">path =</span> <span class="st">"file.txt"</span>)
<span class="kw">write_file</span>(<span class="dt">x =</span> <span class="st">"a b c</span><span class="ch">\n</span><span class="st">1 2 3</span><span class="ch">\n</span><span class="st">4 5 NA"</span>, <span class="dt">path =</span> <span class="st">"file.fwf"</span>)
<span class="kw">write_file</span>(<span class="dt">x =</span> <span class="st">"a</span><span class="ch">\t</span><span class="st">b</span><span class="ch">\t</span><span class="st">c</span><span class="ch">\n</span><span class="st">1</span><span class="ch">\t</span><span class="st">2</span><span class="ch">\t</span><span class="st">3</span><span class="ch">\n</span><span class="st">4</span><span class="ch">\t</span><span class="st">5</span><span class="ch">\t</span><span class="st">NA"</span>, <span class="dt">path =</span> <span class="st">"file.tsv"</span>)</code></pre></div>
<p> </p>
</div>
<div id="saving-your-data-from-r" class="section level1">
<h1>Saving your data from <code>R</code></h1>
<p>Save <code>x</code>, an <code>R</code> object, to <code>path</code>, a file path</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r"><span class="co"># Comma delimited file</span>
<span class="kw">write_csv</span>(x, path, <span class="dt">na =</span> <span class="st">"NA"</span>, <span class="dt">append =</span> <span class="ot">FALSE</span>, <span class="dt">col_names =</span> <span class="op">!</span>append)
<span class="co"># File with arbitrary delimiter</span>
<span class="kw">write_delim</span>(x, path, <span class="dt">delim =</span> <span class="st">" "</span>, <span class="dt">na =</span> <span class="st">"NA"</span>, <span class="dt">append =</span> <span class="ot">FALSE</span>, <span class="dt">col_names =</span> <span class="op">!</span>append)
<span class="co"># CSV for excel</span>
<span class="kw">write_excel_csv</span>(x, path, <span class="dt">na =</span> <span class="st">"NA"</span>, <span class="dt">append =</span> <span class="ot">FALSE</span>, <span class="dt">col_names =</span> <span class="op">!</span>append)
<span class="co"># String to file</span>
<span class="kw">write_file</span>(x, path, <span class="dt">append =</span> <span class="ot">FALSE</span>) String vector to file, one element per line
<span class="kw">write_lines</span>(x,path, <span class="dt">na =</span> <span class="st">"NA"</span>, <span class="dt">append =</span> <span class="ot">FALSE</span>) Object to RDS file
<span class="kw">write_rds</span>(x, path, <span class="dt">compress =</span> <span class="kw">c</span>(<span class="st">"none"</span>, <span class="st">"gz"</span>, <span class="st">"bz2"</span>, <span class="st">"xz"</span>), ...)
<span class="co"># Tab delimited files</span>
<span class="kw">write_tsv</span>(x, path, <span class="dt">na =</span> <span class="st">"NA"</span>, <span class="dt">append =</span> <span class="ot">FALSE</span>, <span class="dt">col_names =</span> <span class="op">!</span>append)</code></pre></div>
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