https://www.thothal.com/tags/tidyverse/ Recent content in Tidyverse on thothal.com Hugo en-US Thu, 10 Mar 2022 00:00:00 +0000 https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/ Thu, 10 Mar 2022 00:00:00 +0000 https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/ <link href="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/htmltools-fill/fill.css" rel="stylesheet" /> <script src="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/htmlwidgets/htmlwidgets.js"></script> <script src="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/plotly-binding/plotly.js"></script> <script src="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/typedarray/typedarray.min.js"></script> <script src="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/jquery/jquery.min.js"></script> <link href="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/crosstalk/css/crosstalk.min.css" rel="stylesheet" /> <script src="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/crosstalk/js/crosstalk.min.js"></script> <link href="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/plotly-htmlwidgets-css/plotly-htmlwidgets.css" rel="stylesheet" /> <script src="https://www.thothal.com/2022/03/10/aggregate-data-with-nested-groups/index.en_files/plotly-main/plotly-latest.min.js"></script> <div id="a-short-general-primer-on-loops" class="section level2"> <h2>A Short General Primer on Loops</h2> <p>In my daily programming I barely use any base <code>for</code> loops. I used to rely on <code>lapply</code> and friends a lot, then switched to the <code>plyr</code> family of apply functions and eventually ended up using the <code>purr::map_*</code> family of functions.</p> <p>There is a bit of overhead involved in <code>map</code>and <code>[lvs]apply</code> can be faster / more efficient, but I do like the verbosity of <code>map</code> and friends as well as the possibility to use lambda functions via <code>~</code><a href="#fn1" class="footnote-ref" id="fnref1">¹</a>. Especially the predictability of the result as opposed to <code>sapply</code> for instance is a clear plus. Also, if you want the apply function to return something else than a list the <code>map_*</code> variants become rather handy.</p>