For loops for ggplot2 not returning y axis labels-CodePudding

I am trying to plot multiple y values vs a single x value. I want the graphs to be in seperate figures. The following code is working to generate the graphs, but the y axes are labeled "taxonomy_metadata_combined_p21[,i]" and I want them to have the same labels as the column titles. I have tried multiple different things but how can I change the y axes label?

for(i in 2:ncol(taxonomy_metadata_combined_p21)) {                              
  print(ggplot(taxonomy_metadata_combined_p21, aes(x = Txt_Sex, y = taxonomy_metadata_combined_p21[ , i]))  
          geom_boxplot()) 
    ylab(colnames(taxonomy_metadata_combined_p21)[i])
}

CodePudding user response：

Your ylab() was added after the print() function. If you print after adding ylab() it should work.

As a sidenote; it is not recommended to use y = taxonomy_metadata_combined_p21[ , i] as an aesthetic. The ggplot2 authors instead recommend to use the .data pronoun if the column name is known.

Reprex with built-in data:

library(ggplot2)

df <- rev(iris)

for (i in 2:ncol(df)) {
  p <- ggplot(df, aes(x = Species, y = .data[[colnames(df)[i]]]))  
    geom_boxplot()  
    ylab(colnames(df)[i])
  print(p)
}