👀 Views: 17 💬 Answers: 1 📅 Created: 2025-07-03

r ggplot2 tidyr R

I'm relatively new to this, so bear with me. I've been banging my head against this for hours. I've searched everywhere and can't find a clear answer... I'm experiencing an scenario when trying to create a faceted plot with `ggplot2` after reshaping my data using `tidyr::pivot_longer()`. The data looks fine after the transformation, but when I attempt to plot it, I receive an behavior that says 'behavior in eval(expr, envir, private$dataset) : object 'my_variable' not found'. Here is the code I'm using: ```r library(tidyr) library(ggplot2) # Sample data my_data <- data.frame( id = 1:4, measurement_a = c(5, 2, 3, 4), measurement_b = c(10, 15, 10, 20) ) # Reshaping the data long_data <- my_data %>% pivot_longer(cols = starts_with('measurement'), names_to = 'type', values_to = 'value') # Attempting to plot p <- ggplot(long_data, aes(x = id, y = value)) + geom_line() + facet_wrap(~ type) p ``` When I run this code, it throws the behavior I mentioned. I've checked that the `type` column is correctly populated with 'measurement_a' and 'measurement_b', and the `value` column has the corresponding numeric values. I also tried using `dplyr::select()` before plotting to ensure there were no unwanted columns, but that didn’t help. Is there something I'm missing in the way I'm structuring my data before plotting? Any suggestions would be greatly appreciated! I'm using R version 4.2.1 and `ggplot2` version 3.3.5. This is part of a larger CLI tool I'm building. Any help would be greatly appreciated! How would you solve this? My development environment is CentOS. I'd be grateful for any help. I'm using R 3.11 in this project. Any suggestions would be helpful.