Understanding the Problem with Adding a Legend to a ggplot2 Plot

Line Plot with Multiple Lines Using Data from Excel in R

Overcoming Hex Code Visibility in Animated Bar Plots with Data Labels in gganimate

How to Integrate Maps in R with ggmap: A Step-by-Step Guide

Using Partial Derivatives in R with ggplot2: A Guide to Custom Plots and Mathematical Notation

Mastering Legends in ggplot2: A Comprehensive Guide to Combining and Customizing Legend Behavior

To answer your question based on the provided code snippet, it seems like you're trying to create a line graph where the x-axis represents different variables and the y-axis represents values. The `gather` function is used to pivot the data from wide format to long format, which is necessary for creating a line graph.

Creating Proportional Tile Sizes with Heatmaps in ggplot2: A Step-by-Step Guide

How to Use Grouping in ggplot2 for Smooth Line Charts

Using Labeller to Automatically Add Units to Strip Labels in ggplot2 Facet Wrap Plots: A Practical Guide