How to plot subplots using plotly in R?
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How to plot subplots using plotly in R?

How to plot subplots using plotly in R?

This recipe helps you plot subplots using plotly in R

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Recipe Objective

A line chart is a type of chart which showcases information as a sequence of data points also known as 'markers' which are connected by staright line. It is mainly used to plot the relationship or trend of a categorical variable with respect to a numerical variable. This type of chart could be one of the best example for subplotting. Any two graphs can be plotted side-by-side using subplot() function in Plotly. ​

In this recipe we are going to use Plotly package to plot the required line chart using Dual y axis. Plotly package provides an interface to the plotly javascript library allowing us to create interactive web-based graphics entrirely in R. Plots created by plotly works in multiple format such as: ​

  1. R Markdown Documents
  2. Shiny apps - deploying on the web
  3. Windows viewer

Plotly has been actively developed and supported by it's community. ​

This recipe demonstrates how to create two subplots (line charts) in R using plotly package ​

STEP 1: Loading required library and creating a dataframe

We will use an example of no of schools established in 2 states between 1970 and 2014

# Data manipulation package library(tidyverse) # plotly package for data visualisation install.packages("plotly") library(plotly) # years year = c('1970','1980', '1990', '2000', '2013', '2014') #no of schools in state1 corresponding to a particular year no_of_schools_state1 = c(15, 30, 60, 120, 240, 300) #no of schools in state2 corresponding to a particular year no_of_schools_state2 = c(55, 85, 200, 450, 600, 700) #creating a dataframe df = data.frame(year,no_of_schools_state1, no_of_schools_state2) df
year	no_of_schools_state1	no_of_schools_state2
1970	15			55
1980	30			85
1990	60			200
2000	120			450
2013	240			600
2014	300			700

STEP 2:Plotting 2 subplots (line charts) using Plotly

We use the plot_ly() and subplot() function to plot 2 line charts side-by-side.

Note:

  1. The %>% sign in the syntax earlier makes the code more readable and enables R to read further code without breaking it.
  2. We also use layout() function to give a title to the graph
# line chart 1 fig1 = plot_ly() %>% add_lines(data = df, x = ~year, y = ~no_of_schools_state1, name = "State1") #line chart 2 fig2 = plot_ly() %>% add_lines(data = df, x = ~year, y = ~no_of_schools_state2, name = "State2") # subplotting fig 1 and 2 fig = subplot(fig1, fig2) fig = fig %>% layout(title = 'Subplots using Plotly') embed_notebook(fig)

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