Join Mark Niemann-Ross for an in-depth discussion in this video Running a unit test, part of Code Clinic: R (2015).
- So now that you've completely understand cross correlation…the rest of my solution is gonna be pretty simple.…I've opened up two files.…One of them called test.R and another one called…isthisacroppedversionofthat.R…Let's take a look at how they run.…First of all, test.R sets up for a test…and the first thing that is has to do,…of course, is install a package.…So let's go ahead and do that.…And, we've already installed it,…so we can ignore this warning.…
Then I go ahead and call that package in using library(jpeg)…Line 6 is setwd(). It's a set working directory command.…We're already in the correct directory…so I don't need to use this one.…And I do need to make sure isthisacroppedversionofthat.R…is in memory so it can be used later on.…I can use the source command to go ahead and do that.…All it does is pull that file into memory for our use later.…Line 9 through line 18 declares…something called funcWrapper.…
It's a function, and all it's doing is wrapping…a function around the subroutine call…we're going to make here in a minute,…
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: Running a unit test