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How to Create an Animated Line Graph using Plotly

How to Add Constant Line to Animated Plot in Plotly?

Last Updated : 26 Apr, 2025

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Animated plots are a useful way to visualize data over time or to highlight the relationship between different variables. In this article, we will learn how to create animated plots using the plot_ly() function in R Programming Language.

To create an animated plot in R, we will use the plot_ly() function from the plotly package. This function allows us to create a variety of interactive plots, including line plots, scatter plots, and bar plots. We can also use the add_lines() function to add constant lines to the plot.

Install and Load Packages

Install and load the necessary packages: Plotly and ggplot2.

R

install.packages("plotly") install.packages("ggplot2") library(plotly) library(ggplot2)

Load the data that you want to use for the plot.

R

data <- read.csv("data.csv")

Create the plot using the plot_ly() function. Specify the variables to use for the x-axis, y-axis, and frame (for the animation). Set the type argument to "scatter", "bar", or "line" and the mode argument to "lines", "markers", or "text".

R

p <- plot_ly( x = data$x, y = data$y, frame = data$time, type = "scatter", mode = "lines" )

Use the add_lines() function to add constant lines to the plot. Specify the value for the constant line in the y argument.

R

p <- add_lines(p, y = rep(1, length(data$x)))

Example: This will create an animated scatter plot with points colored according to the value of the cut variable in the diamonds dataset. The plot will also include a constant line at y = 1.

R

library(plotly) library(ggplot2) library(dplyr)  # Select a small sample of the data diamonds_sample <- sample_n(diamonds, size = 50)  # Create the plot p <- plot_ly(   x = diamonds_sample$price,   y = diamonds_sample$carat,   type = "scatter",   mode = "markers",   frame = diamonds_sample$cut,   marker = list(size = 10) )  # Add a constant line at y = 1 p <- add_lines(p,                y = rep(1, length(diamonds_sample$price)))  p

Output:

How to Add Constant Line to Animated Plot in Plotly — Constant Line to Animated Plot in Plotly

How to Create an Animated Line Graph using Plotly

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