Join Mark Niemann-Ross for an in-depth discussion in this video A matrix of possibilities, part of Code Clinic: R.
- So let's step through my solution…for the eight Queens problem.…Lines one, two, and three are…just simply set up for this situation.…Line two sets a working directory,…and you may want to change that…to reflect your own personal computer.…Line three makes sure that we are sourcing plots…to Queens.R, and in order to do that,…I just simply select that line and hit Run.…And it will go ahead and bring in the code…that belongs to that particular function.…Lines six, seven, and eight…uses a command called expand.grid…to create all of the possible options…for the eight Queens solution.…
Let's take a look at expand.grid real quick.…First of all, the thing that you'll always want to do…anytime you bump into a new command…is pull up the documentation,…so I type in, in the Console,…?e-x-p-a-n-d.g-r-i-d.…And to my right…I see that I have documentation for…expand.grid.…And we can open that up a bit and scroll around.…I'll leave it to you to take a look at that in detail.…But essentially what expand.grid does…is bring up all the possible options…
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: A matrix of possibilities