Join Mark Niemann-Ross for an in-depth discussion in this video Walking the unit tests, part of Code Clinic: R (2015).
- Let's walk the code.…This project is broken into three files,…unit_tests.R, shown here in RStudio,…getpendoreille_unfactored.R.…Here's factored and here's unfactored.…We'll talk about this in a minute.…And a file called LakePendOreilleData,…which looks like this, right here.…Now, let's first of all look at code that works…and then we'll look at the original code…that no longer works, so we can see…how it was improved.…
The first program to look at is unit_tests under bar POR.…Let's go to that file, and I'm showing that now…in the source window of RStudio.…Let's step through here, and see what's actually happening.…Line number 1 is a comment, and all comments…start with a # mark.…So this is just a comment that says "set up."…Line 2 is install.packages and you'll recall…we talked about installing packages.…In this line, we installed a package called "lubridate"…which gives us a more sophisticated access…to dates and times.…
The third line is a library, (lubridate),…and that pulls lubridate into the working source code.…
Author
Mark Niemann-Ross
Updated
6/25/2015Released
4/23/2015Mark introduces challenges and then provides an overview of his solutions in R. Challenges include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.
Visit other courses in the series to see how to solve the exact same challenges in languages like C++, C#, JavaScript, PHP, Python, Ruby, and Swift.
Skill Level Intermediate
Duration
Views
Q: R Studio tells me that it can't find files I expect to be available. Where can I find them?
A: Use the setwd() command to set the working directory to match the folder you're working in.
Q: I am unable to access the Lake Pend Oreille data from outside the U.S.
A: A static copy of this data is provided here for lynda.com members outside of the U.S.
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Introduction
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Welcome1m 12s
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Using the exercise files1m 9s
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Using RStudio4m 58s
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The R programming language10m 29s
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Debugging with browser()4m 26s
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1. Problem One: Statistical Analysis
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Overview of my solution1m 52s
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Changes at Lake Pend Oreille1m 24s
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Walking the unit tests3m 53s
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Three lessons learned1m 26s
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2. Problem Two: Image Analysis
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Applying CCF to images7m 58s
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Running a unit test2m 22s
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Exploring funcwrapper1m 10s
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Stepping across the image5m 33s
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3. Problem Three: Eight Queens
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Overview of my solution1m 29s
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A matrix of possibilities6m 44s
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Understanding countUnique.R6m 33s
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4. Accessing Peripherals
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Testing mouse access1m 40s
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Testing sound generation5m 22s
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5. Recursion and Directories
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Walking the directory sort code10m 56s
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6. Building the Web
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Overview of my solution4m 16s
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Installing and using Shiny4m 46s
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Setting up the app directory3m 25s
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Modifying index.html5m 13s
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Modifying server.R19m 6s
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Video: Walking the unit tests