Using other packages

This lesson is called Using other packages, part of the Package Development with R course. This lesson is called Using other packages, part of the Package Development with R course.

Transcript

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Your Turn

Working in exercises.Rmd:

Fix the code in R/themes.R to use ggplot2:: instead of library(ggplot2)
Run use_package(“ggplot2”) to add ggplot2 to Imports
Re-load the package (Cmd/Ctrl+Shift+L) and run this code to make sure it works

use_package("ggplot2")

### in R/themes.R:

theme_avalanche <- function() { 
     ggplot2::theme_minimal(base_size = 14) + 
     ggplot2::theme(panel.grid.minor = ggplot2::element_blank())
}

Learn More

You can learn more about using functions from other packages in your package in the Dependencies chapter of the R Packages book.

Have any questions? Put them below and we will help you out!

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Mark Engelbert • January 18, 2024

I'm finding that even after fixing the themes.R file, running use_package("ggplot2"), and re-loading the package, I get a "could not find function 'ggplot' " error when I try to run the next code block. I can only get that code block to work if I put ggplot2:: in front of all the ggplot functions in the block. But in the solution video, the block runs without ggplot2::. I took a screen capture of what I'm getting. Any idea what I'm doing wrong?

David Keyes Founder • January 19, 2024

So I think what is happening is that the code you are trying to run is totally separate from the function you're working on. While you can now use the ggplot() function in your theme_avalanche() function, the ggplot2 package is not loaded when you are trying to run your code in the R Markdown document. You still need to run library(ggplot2) or library(tidyverse) in order to use ggplot there. Does that make sense?

Mark Engelbert • January 22, 2024

That makes sense, yeah. I guess when Malcolm says (in the Solution video) "Now our function will work without having loaded the ggplot2 package", I took that to mean he didn't have ggplot2 loaded in the global environment and I was trying to replicate that.

All good now, thanks for the help.