Facets in ggplot2 are great for showing multiple plots on a single canvas. Assuming this usually covers many scenarios, there might be a case that you would want to save all the combinations of x and y variables in a plot as a file. Useless scenario, and again somehow useful.
Given a x-variable (in this case Species) we would like to have as much as four plots, each time with different y-variable (in this case Petal.Width). So the combinations would be:
- Species x Petal.Width
- Species x Petal.Length
- Species x Sepal.Width
- Species x Sepal.Length
Creating a helper function that will take an input string and convert it to variable for boxplot:
# Helper function
Iris_plot <- function(df=iris, y) {
ggplot(df, aes(x = Species, y = !! sym(y) )) +
geom_boxplot(notch = TRUE) +
theme_classic(base_size = 10)
}
Once we have a helper function defined, loop into the datasets:
# Main loop through the columns and dataset
for(varR in variableR){
name <- paste0(varR, "_x_Species")
png(paste0(name, ".png"))
print(Iris_plot(df=iris, y=varR))
dev.off()
}
At the end, you will have in your work enviroment (check path by getwd() ) files, each holding the combination of graph.
As always, code is available in at the Github in same Useless_R_function repository.
Happy R-coding!
TomazTsql 
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Hi Tom,
Thanks for this post,
Great to save plots!.
quick Q:
How to modify the function:
for(varR in variableR){
name <- paste0(varR, "_x_Species")
png(paste0(name, ".png"))
print(Iris_plot(df=iris, y=varR))
dev.off()
}
so that the plots are displayed directly in Rstudio ?,
(not saved as files…).
Just learning R.
Thanks!.
Joe
SF
latest R, Rstudio, Ubuntu Linux.
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Hello Tomaz,
Thanks for the useless-useful tip here.
I realised `library(rlang)` was needed to run `y = !! sym(y)` but when I ran the whole lot, this message appears:
“Error in variableR : object ‘variableR’ not found”
I’m also new-ish to R, so wondered if I need to substitute `variableR` with something else – or do I need another library open?
Thanks in advance,
Stuart
R version 4.1.0 (2021-05-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19042)
RStudio:
$version
[1] ‘1.4.1717’
$release_name
[1] “Juliet Rose”
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Nice Post Oracle Cloud Automated Testing Tool
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