CODEWITHSUNDEEP
rggplot2
rrachel95
rrachel95

Reputation: 53

have a list of ggplots in R, would like to put them in a folder

I created a list of graphs using this function:

p.list = lapply(sort(unique(new$tree)), function(i){ 
  ggplot(new[new$tree==i,], aes(age,height)) + geom_point() + theme_classic() + facet_wrap(~tree)})

This produced a list of 34 graphs, but I cannot view them. I am hoping to save them as separate files (save them as .jpeg images) in a single folder, and have each file labelled by "tree". Any advice on this is much appreciated!

Upvotes: 1

Views: 192

Answers (3)

Phil
Phil

Reputation: 8107

A more tidyverse-y answer using the iris data as per Rui Barradas:

library(tidyverse)
library(glue)

p.list <- iris %>% 
  pull(Species) %>% 
  unique() %>% 
  sort() %>% 
  set_names() %>% 
  map(function(i){ 
        ggplot(filter(iris, Species == i), aes(Sepal.Length, Sepal.Width)) + 
           geom_point() + 
           theme_classic()
    })

iwalk(p.list, ~ ggsave(glue("{.y}.jpg"), .x, device = "jpeg"))

Upvotes: 0

Rui Barradas
Rui Barradas

Reputation: 76402

Here is a solution with ggsave. It allows to specify the device as an argument.

tree_names <- sort(unique(iris$Species))
folder_name <- "~/tmp"
for(i in seq_along(p.list)){
  flname <- paste0("tree_", tree_names[i], ".jpeg")
  flname <- file.path(folder_name, flname)
  ggsave(flname, plot = p.list[[i]], device = "jpeg")
}
#Saving 4.68 x 5.84 in image
#Saving 4.68 x 5.84 in image
#Saving 4.68 x 5.84 in image

Data

As a test data set I have used the following based on the built-in data set iris.

p.list <- lapply(sort(unique(iris$Species)), function(i){ 
  ggplot(iris[iris$Species == i,], aes(Sepal.Length, Sepal.Width)) + 
    geom_point() + 
    theme_classic()
  })

Upvotes: 1

Allan Cameron
Allan Cameron

Reputation: 173793

You can do a simple loop:

for(i in seq_along(p.list)){
  jpeg(filename = paste0("ggplot_", sort(unique(new$tree))[i], ".jpg"))
  print(p.list[[i]])
  dev.off()
}

This will write the files ggplot_1.jpg, ggplot_2.jpg etc to your home directory.

Upvotes: 3

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