Here is an example of saving them as .tiff or .pdf (you can do .png or other formats too). Second example is typically the most standard which people use which makes use of ggsave
############################Example 1:
# Plot separate ggplot figures in a loop.
library(ggplot2)
# Make list of variable names to loop over.
var_list = combn(names(iris)[1:3], 2, simplify=FALSE)
# Make plots.
plot_list = list()
for (i in 1:3) {
p = ggplot(iris, aes_string(x=var_list[[i]][1], y=var_list[[i]][2])) +
geom_point(size=3, aes(colour=Species))
plot_list[[i]] = p
}
# Save plots to tiff. Makes a separate file for each plot.
for (i in 1:3) {
file_name = paste("iris_plot_", i, ".tiff", sep="")
tiff(file_name)
print(plot_list[[i]])
dev.off()
}
# Another option: create pdf where each page is a separate plot.
pdf("plots.pdf")
for (i in 1:3) {
print(plot_list[[i]])
}
dev.off()
#> png
#> 2
############################Example 2:
library(ggplot2)
data("iris")
# list of values to loop over
uniq_species = unique(iris$Species)
# Loop
for (i in uniq_species) {
temp_plot = ggplot(data= subset(iris, Species == i)) +
geom_point(size=3, aes(x=Petal.Length, y=Petal.Width )) +
ggtitle(i)
ggsave(temp_plot, file=paste0("plot_", i,".png"), width = 14, height = 10, units = "cm")
}
Created on 2022-01-10 by the reprex package (v2.0.0)