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Subsetting.html
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<h1>Subsetting</h1>
<p><big><strong>Some hints:</strong></big></p>
<p><em>Functions to look up (Technically,</em> <code>women</code> <em>is a default dataset in R)</em></p>
<pre><code>?seq
?"["
?women
</code></pre>
<p><em>Code examples</em><br/>
Note that this output has '#'es before it for ease of copying and pasting.</p>
<pre><code class="r"># Generate sequence from 1 to 10 in steps of 2
seq(from = 1, to = 10, by = 2)
</code></pre>
<pre><code>## [1] 1 3 5 7 9
</code></pre>
<pre><code class="r"># Show the dataframe `women` that comes with R
women
</code></pre>
<pre><code>## height weight
## 1 58 115
## 2 59 117
## 3 60 120
## 4 61 123
## 5 62 126
## 6 63 129
## 7 64 132
## 8 65 135
## 9 66 139
## 10 67 142
## 11 68 146
## 12 69 150
## 13 70 154
## 14 71 159
## 15 72 164
</code></pre>
<pre><code class="r"># Show the first row of women
women[1, ]
</code></pre>
<pre><code>## height weight
## 1 58 115
</code></pre>
<pre><code class="r"># Show the first column of women
women[, 1]
</code></pre>
<pre><code>## [1] 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
</code></pre>
<pre><code class="r"># Show the column of women titled 'height'
women[, "height"]
</code></pre>
<pre><code>## [1] 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72
</code></pre>
<pre><code class="r"># Get the 2nd, 3rd and 7th rows
women[c(2, 3, 7), ]
</code></pre>
<pre><code>## height weight
## 2 59 117
## 3 60 120
## 7 64 132
</code></pre>
<pre><code class="r"># Show women without the 2nd, 3rd and 7th row.
women[-c(2, 3, 7), ]
</code></pre>
<pre><code>## height weight
## 1 58 115
## 4 61 123
## 5 62 126
## 6 63 129
## 8 65 135
## 9 66 139
## 10 67 142
## 11 68 146
## 12 69 150
## 13 70 154
## 14 71 159
## 15 72 164
</code></pre>
<pre><code class="r"># How many rows and columns does the data have?
nrow(women)
</code></pre>
<pre><code>## [1] 15
</code></pre>
<pre><code class="r">ncol(women)
</code></pre>
<pre><code>## [1] 2
</code></pre>
<pre><code class="r"># Get the last row in the first column
women[nrow(women), 1]
</code></pre>
<pre><code>## [1] 72
</code></pre>
<p><big><strong>Your mission</strong></big><br/>
Take this dataframe:</p>
<pre><code class="r">dat <- data.frame(a = c(1, 2, 4, 5, 2), b = c(3, 5, 7, 34, 3), c = c(7, 2, 3,
6, 7))
dat
</code></pre>
<pre><code>## a b c
## 1 1 3 7
## 2 2 5 2
## 3 4 7 3
## 4 5 34 6
## 5 2 3 7
</code></pre>
<p>And get every odd-numbered row of the third column:</p>
<pre><code>## [1] 7 3 7
</code></pre>
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