<p><div><div><div><div data-width="100" data-show-faces="false" data-send="true" data-layout="button_count" data-height="21" data-href="https://www.r-bloggers.com/interactive-subsetting-exercises/"></div></div><div><a data-url="https://www.r-bloggers.com/interactive-subsetting-exercises/" data-counturl="https://www.r-bloggers.com/interactive-subsetting-exercises/" data-count="horizontal" data-text="Interactive Subsetting Exercises" class="twitter-share-button" data-via="rbloggers" href="https://twitter.com/share"></a></div><div></div></div><div></div></div>
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(This article was first published on <strong><a href="http://r-exercises.com/2016/07/29/interactive-subsetting-exercises/"> R-exercises</a></strong>, and kindly contributed to <a rel="nofollow" href="https://www.r-bloggers.com/">R-bloggers)</a> </div>
<p><a target="_blank" href="http://r-exercises.com/wp-content/uploads/2016/07/box-24557_960_720.png?ace78c"><img sizes="(max-width: 300px) 100vw, 300px" srcset="http://r-exercises.com/wp-content/uploads/2016/07/box-24557_960_720-300x282.png 300w, http://r-exercises.com/wp-content/uploads/2016/07/box-24557_960_720-600x565.png 600w, http://r-exercises.com/wp-content/uploads/2016/07/box-24557_960_720.png 765w" alt="box-24557_960_720" class="wp-image-1026" src="https://i0.wp.com/r-exercises.com/wp-content/uploads/2016/07/box-24557_960_720-300x282.png?resize=300%2C282" data-recalc-dims="1"></a>The function, “<code>subset()</code>” is intended as a convienent, interactive substitute for subsetting with brackets. <code>subset()</code> extracts subsets of matrices, data frames, or vectors (including lists), according to specified conditions.</p>
<p>Answers to the exercises are available <a target="_blank" href="http://r-exercises.com/2016/07/29/interactive-subsetting-solutions/">here</a>.</p>
<p><strong>Exercise 1</strong></p>
<p>Subset the vector, “<code>mtcars[,1]</code>“, for values greater than “<code>15.0</code>“.</p>
<p><strong>Exercise 2</strong></p>
<p>Subset the dataframe, “<code>mtcars</code>” for rows with “<code>mpg</code>” greater than , or equal to, 21 miles per gallon.</p>
<p><strong>Exercise 3</strong></p>
<p>Subset “<code>mtcars</code>” for rows wih “<code>cyl</code>” less than “<code>6</code>“, and “<code>gear</code>” exactly equal to “<code>4</code>“.</p>
<p><strong>Exercise 4</strong></p>
<p>Subset “<code>mtcars</code>” for rows greater than, or equal to, 21 miles per gallon. Also, select only the columns, “<code>mpg</code>” through “<code>hp</code>“.</p>
<p><strong>Exercise 5</strong></p>
<p>Subset “<code>airquality</code>” for “<code>Ozone</code>” greater than “<code>28</code>“, or “<code>Temp</code>” greater than “<code>70</code>“. Return the first five rows.</p>
<p><strong>Exercise 6</strong></p>
<p>Subset “<code>airquality</code>” for “<code>Ozone</code>” greater than “<code>28</code>“, and “<code>Temp</code>” greater than “<code>70</code>“. Select the columns, “<code>Ozone</code>” and “<code>Temp</code>“. Return the first five rows.</p>
<p><strong>Exercise 7</strong></p>
<p>Subset the “<code>CO2</code>” dataframe for “<code>Treatment</code>” values of “<code>chilled</code>“,<br>
and “<code>uptake</code>” values greater that “<code>15</code>“. Remove the category, “<code>conc</code>“. Return the first 10 rows.</p>
<p><strong>Exercise 8</strong></p>
<p>Subset the “<code>airquality</code>” dataframe for rows without “<code>Ozone</code>” values of “<code>NA</code>“.</p>
<p><strong>Exercise 9</strong></p>
<p>Subset “<code>airquality</code>” for “<code>Ozone</code>” greater than “<code>100</code>“. Select the columns “<code>Ozone</code>“, “<code>Temp</code>“, “<code>Month</code>” and “<code>Day</code>” only.</p>
<p><strong>Exercise 10</strong></p>
<p>Subset “<code>LifeCycleSavings</code>” for “<code>sr</code>” greater than “<code>8</code>“, and less than “<code>10</code>“. Remove columns “<code>pop75</code>” through “<code>dpi</code>“.</p>
<p>Image by Clker-free-vector-images (Pixabay post) [<a target="_blank" href="https://creativecommons.org/publicdomain/zero/1.0/deed.nl">CC0 Public Domain </a>], <a target="_blank" href="https://pixabay.com/static/uploads/photo/2012/04/02/13/55/box-24557_960_720.png">via Pixabay</a>.</p>
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