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Candlestick, Pie, Gauge, Intensity Charts

In the fifth part of our journey we will meet some special but more and more usable types of charts that googleVis provides. More specifically you will learn about the features of Candlestick, Pie, Gauge and Intensity Charts.

Read the examples below to understand the logic of what we are going to do and then test yous skills with the exercise set we prepared for you. Lets begin!

Answers to the exercises are available here.

Package & Data frame

As you already know, the first thing you have to do is install and load the googleVis package with:
`install.packages("googleVis")`

``` ```

`library(googleVis)`

Secondly we will create an experimental data frame which will be used for our charts’ plotting. You can create it with:
`co=data.frame(country=c("US", "GB", "BR"),`

``` population=c(15,17,19), ```

` size=c(33,42,22))`

NOTE: The charts are created locally by your browser. In case they are not displayed at once press F5 to reload the page.

Candlestick chart

It is quite simple to create a Candlestick Chart with googleVis. We will use the “OpenClose” dataset. Look at the example below:
```CandleC <- gvisCandlestickChart(OpenClose, options=list(legend='none')) plot(CandleC)```

Exercise 1

Create a list named “CandleC” and pass to it the “OpenClose” dataset as an candlestick chart. HINT: Use `gvisCandlestickChart()`.

Exercise 2

Plot the the candlestick chart. HINT: Use `plot()`.

Pie chart

It is quite simple to create a Pie Chart with googleVis. We will use the “CityPopularity” dataset. Look at the example below:
```PieC <- gvisPieChart(CityPopularity) plot(PieC)```

Exercise 3

Create a list named “PieC” and pass to it the “CityPopularity” dataset as a pie chart. HINT: Use `gvisPieChart()`.

Learn more about using GoogleVis in the online course Mastering in Visualization with R programming. In this course you will learn how to:

• Work extensively with the GoogleVis package and its functionality
• Learn what visualizations exist for your specific use case
• And much more

Exercise 4

Plot the the pie chart. HINT: Use `plot()`.

Gauge

The gauge chart is not very common compared with those we saw before but can be useful under certain circumstances. We will use the “CityPopularity” dataset. Look at the example:
```GaugeC <- gvisGauge(CityPopularity) plot(GaugeC)```

Exercise 5

Create a list named “GaugeC” and pass to it the “CityPopularity” dataset as a gauge chart. HINT: Use `gvisGauge()`.

Exercise 6

Plot the the gauge. HINT: Use `plot()`.

The gauge gives you the ability to use colours in order to separate easier each area from the other. For example:
`options=list(min=0, max=1200, blueFrom=900,blueTo=1200,greenFrom=600,`

``` greenTo=900, yellowFrom=300, yellowTo=600, ```

` redFrom=0, redTo=300, width=400, height=300)`

Exercise 7

Separate the gauge to three areas by colours of your choice, from 0 to 900 and plot it. HINT: Use `list()`.

Exercise 8

Set `width` to 400 and `height` to 300. HINT: Use `width` and `height`.

Intensity Map

The last chart we are going to see in this part is the Intensity Map.
It is quite simple to create an Intensity Map with googleVis. We will use the experimental data frame “co” we created before. Look at the example below:
```IntensityC <- gvisIntensityMap(co) plot(IntensityC)```

Exercise 9

Create a list named “IntensityC” and pass to it the “co” dataset you just created as an intenisty map. HINT: Use `gvisIntensityMap()`.

Exercise 10

Plot the the intensity map. HINT: Use `plot()`.