Slides/Lesson_4.html at master · ComputationalMovementAnalysis/Slides · GitHub

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			<section>
				<h1 class="r-fit-text">Feedback Exercise 2</h1>
			</section>

			<section>

				Using <code>mutate</code>

				<p class="left">instead of writing: </p>

				<pre><code data-trim class="r" data-line-numbers="">
						wildschwein <- wildschwein |>
							group_by(TierID) |>
							mutate(timelag_sec = as.numeric(...) |>
							mutate(timelag_min = as.numeric(....) |>
							mutate(timelag_hours = as.numeric(...)
					</code></pre>


				<div class="fragment">
					<p class="left">you can write this:</p>

					<pre><code data-trim class="r" data-line-numbers="">
							wildschwein <- wildschwein |>
							group_by(TierID) |>
							mutate(
							  timelag_sec = as.numeric(....),
							  timelag_min=as.numeric(...),
							  timelag_hours=as.numeric(...)
							  )
						</code></pre>
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			</section>
			<section>
				<p class="left">using <code>summarize()</code> with <code>sf</code> objects</p>

				<ul style="font-size: xx-large">
					<li class="fragment"><code>sf</code> objects contain geometries (e.g. <em>Points</em> for our
						Wildboar data) </li>
					<li class="fragment"><code>summarize()</code> will also try to summarize these geometries (with a
						<code>union</code>)</li>
					<li class="fragment"> this is often not what you intend (especially in E2)</li>
					<li class="fragment"> the operation usually takes a long time</li>
					<li class="fragment"> you can prevent this by dropping the geometry beforehand</li>
				</ul>

				<pre class="fragment"><code data-trim class="r" data-line-numbers="">
						wildschwein_BE |>
							st_drop_geometry() |>   #<- removes the geometry column
							group_by(TierID) |>
							summarise(mindate = min(DatetimeUTC))
					</code></pre>


			</section>

			<section>
				<h3>Housekeeping</h3>

				<p class="left">When working with Github, we recommend following housekeeping practices:</p>

			</section>

			<section>
				<h3>Good</h3>

				<p class="left"> Close your issues after you have solved them. </p>
				<img data-src="images/gh_good.jpg" style="width:80%">
			</section>
			<section>
				<h3>Better</h3>

				<p class="left">Close your issues <em>with a comment.</em></p>
				<img data-src="images/gh_better.jpg" style="width:80%">
			</section>
			<section>
				<h3>Pro</h3>

				<p class="left">Reference the issue in your commit message</p>

				<pre class="fragment"><code data-trim class="txt" data-line-numbers="">
					Added missing csv files, this fixes issue #3
				</code></pre>


				<img data-src="images/gh_pro_crop.jpg" style="width:80%" class="fragment">
			</section>
			<section>
				<h3>Peer Feedback E3</h3>
			</section>

			<section>
				<h3>Reminder:</h3>
				<ul>
					<li class="fragment">Submit the Github URL to E3</li>
					<li class="fragment">Submit the Github URL to your semester project</li>
					<li class="fragment">Choose a slot for a coaching session on <a href="https://moodle.zhaw.ch/course/view.php?id=3149">moodle</a></li>
				</ul>
			</section>


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