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R Shiny App

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26 BE 9063: Computing with R: Shiny
Fall, 2015
MB Rao & Cole Brokamp
Lecture 1: Introduction to the Shiny
Shiny is an R package. Its purpose is enable one to develop an appropriate app fitting the requirements. The package has 11 built-in examples. In our first meeting, we will discuss one such an example.
App 1: Plot a histogram with flexible number of bins under control.
The display panel will have two sections. One section will have a slide bar, which you can use to control the number of bins. The other section will have the histogram which will respond instantaneously to your setting number of bins. The app is used on the ‘old faithful’ data.
Old faithful is a warm water geyser in the Yellowstone National Park in the mid-west. The geyser erupts for a certain length of time and then becomes dormant for a certain length of time. This cycle of eruption and dormancy continues day and night. Someone collected data of these times and published. Let us watch the eruption, if any, live.
Look at the data.
> data(faithful)
> dim(faithful)
[1] 272 2
1 3.600 79
2 1.800 54
3 3.333 74
4 2.283 62
5 4.533 85
6 2.883 55
Interpretation of the data:
> hist(faithful[ , 2], col = "darkgray", xlab = "Waiting Time between Eruptions",
+ ylab = "Frequency", main = "Waiting Times Between Eruptions of Old Faithful")
> summary(faithful) eruptions waiting Min. :1.600 Min. :43.0 1st Qu.:2.163 1st Qu.:58.0 Median :4.000 Median :76.0 Mean :3.488 Mean :70.9 3rd Qu.:4.454 3rd Qu.:82.0 Max. :5.100 Max. :96.0
1. The distribution is bi-modal.
2. Average waiting time is: 70.9 minutes.
3. The number of bins is: 13.
4. The code uses a default formula for the number of bins.
5. One can set the number of bins in the ‘hist’ code and modify the histogram accordingly.
6. The App 1 facilitates instantaneous modification of number of bins.

Let us look at the histogram produced by App 1.

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