How do you use loop in R with ggpie function and save a filename after the dataframe?-CodePudding

I've leaned heavily on a couple other SO posts already, but can't seem to get past this one. Here are the references i've used:

Loop with a defined ggplot function over multiple dataframes

Loop in R to create and save series of ggplot2 plots with specified names

My goal is to use a loop to save each pie plot from the list of dataframes: "Sample_List" (which will be much longer). I keep getting this error though, and am stumped:

"Error: Aesthetics must be either length 1 or the same as the data (1): fill, y"

Data:

DZmix_SC1:

# A tibble: 3 × 4
  Sample_ID Potential_Sources Relative_Contribution Metric
  <chr>     <chr>                             <dbl> <chr> 
1 SC1_18    Uintas                                0 KV    
2 SC1_18    Sierra Madre                         22 KV    
3 SC1_18    CMB                                  78 KV

DZmix_5_SC:

# A tibble: 3 × 4
  Sample_ID Potential_Sources Relative_Contribution Metric
  <chr>     <chr>                             <dbl> <chr> 
1 5-SC_18   Uintas                                0 KV    
2 5-SC_18   Sierra Madre                         29 KV    
3 5-SC_18   CMB                                  71 KV

DZmix_PL3:

# A tibble: 3 × 4
  Sample_ID Potential_Sources Relative_Contribution Metric
  <chr>     <chr>                             <dbl> <chr> 
1 PL3_18    Uintas                               69 KV    
2 PL3_18    Sierra Madre                          0 KV    
3 PL3_18    CMB                                  31 KV

Here's what i have so far:

Sample_list <- c("DZmix_SC1", "DZmix_5_SC", "DZmix_PL3")

DZpie.fn <- function(df,title) {
  df <- df  %>% 
  mutate(Relative_Contribution = round(Relative_Contribution,1)) %>%
  arrange(desc(Potential_Sources))
ggpie(df,"Relative_Contribution", label = "Relative_Contribution",
      fill = "Potential_Sources", color = "white", size = 1.5,
      palette = c("#636363", "#cccccc", "#969696"))  
      lab.pos = c("in"),
      lab.font = c(0, "bold", "black"))  
  theme(legend.position = "none", 
        panel.background = element_rect(fill = "transparent"), 
        plot.background = element_rect(fill = "transparent", color = NA)) 
} #end DZpie.fn

for(i in Sample_list){
  print(DZpie.fn(get(i), i)) 
}

And ultimately i'd like to replace the print function in the loop with a ggsave function that works... heres my effort:

ggsave(DZpie.fn, filename=paste("/outputpath/",i,".png",sep=""))

Thanks in advance for the help!!

CodePudding user response：

This works for me

library(tibble)
library(dplyr)
library(ggpubr)

DZmix_SC1 <- tibble(
  Sample_ID = rep('SC1_18', 3), 
  Potential_Sources = c('Uintas', 'Sierra Madre', 'CMB'), 
  Relative_Contribution = c(0,22,78),
  Metric = rep('KV', 3)
)

DZmix_5_SC <- tibble(
  Sample_ID = rep('5-SC_18', 3), 
  Potential_Sources = c('Uintas', 'Sierra Madre', 'CMB'), 
  Relative_Contribution = c(0,29,71),
  Metric = rep('KV', 3)
)

DZmix_PL3 <- tibble(
  Sample_ID = rep('PL3_18', 3), 
  Potential_Sources = c('Uintas', 'Sierra Madre', 'CMB'), 
  Relative_Contribution = c(69,0,31),
  Metric = rep('KV', 3)
)

Sample_list <- c("DZmix_SC1", "DZmix_5_SC", "DZmix_PL3")

DZpie.fn <- function(df,title) {
  df <- df  %>% 
    mutate(Relative_Contribution = round(Relative_Contribution,1)) %>%
    arrange(desc(Potential_Sources))
  ggpie(df, "Relative_Contribution", label = "Relative_Contribution",
        fill = "Potential_Sources", color = "white", size = 1.5,
        palette = c("#636363", "#cccccc", "#969696"),
        lab.pos = c("in"),
        lab.font = c(0, "bold", "black"))  
  theme(legend.position = "none", 
        panel.background = element_rect(fill = "transparent"), 
        plot.background = element_rect(fill = "transparent", color = NA)) 
} 

for(i in Sample_list){
  print(DZpie.fn(get(i), i)) 
}

Your method is actually correct. You just miss placed before lab.pos = c("in").

Then you can save images using

for (i in Sample_list){
  ggsave(DZpie.fn(get(i), i), filename=paste0("temp/",i,".png"))
}

Or equivalently but without for loop

purrr::walk(Sample_list, function(name) ggsave(DZpie.fn(get(name), name), 
                                               filename=paste0("temp/",name,".png")))