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<div id="assignment" class="section level1">
<h1>Assignment</h1>
<div class="tip">
<h2 id="key-concepts">Key Concepts</h2>
<p>After reading this chapter you should be able to define the following:</p>
<ul>
<li>operators</li>
<li>objects</li>
<li>assignment</li>
</ul>
<p><br> <br></p>
</div>
<div class="figure">
<img src="figures/assignment.png" alt="Assignment of output values" width="590" />
<p class="caption">
Assignment of output values
</p>
</div>
<div id="assignment-1" class="section level2">
<h2>Assignment</h2>
<p>When we call a function in R, the default behavior of the function is typically to print the results on the screen:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb1-1" data-line-number="1"><span class="kw">calcMortgage</span>( <span class="dt">principal=</span><span class="dv">100000</span> )</a></code></pre></div>
<pre><code>## [1] 536.82</code></pre>
<p>If we are creating a script, however, we often need to save the function outputs at each step. We can do this by assigning output to a new variable.</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb3-1" data-line-number="1">payments.<span class="fl">15.</span>year <-<span class="st"> </span><span class="kw">calcMortgage</span>( <span class="dt">years=</span><span class="dv">15</span>, <span class="dt">principal=</span><span class="dv">100000</span> )</a>
<a class="sourceLine" id="cb3-2" data-line-number="2">payments.<span class="fl">30.</span>year <-<span class="st"> </span><span class="kw">calcMortgage</span>( <span class="dt">years=</span><span class="dv">30</span>, <span class="dt">principal=</span><span class="dv">100000</span> )</a></code></pre></div>
<p>These values are then stored, and can be used later or printed by typing the object name:</p>
<div class="sourceCode" id="cb4"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb4-1" data-line-number="1">payments.<span class="fl">15.</span>year</a></code></pre></div>
<pre><code>## [1] 790.79</code></pre>
<div class="sourceCode" id="cb6"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb6-1" data-line-number="1">payments.<span class="fl">30.</span>year</a></code></pre></div>
<pre><code>## [1] 536.82</code></pre>
<p>Note that variable names can include periods or underscores. They can also include numbers, but they cannot start with a number. Like everything in R, they will be case sensitive.</p>
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