How to loop over variables in R?

Question

I'm trying to automate the generation of several segmented bar plots. There are thirteen variables that I'm trying to loop over, named as per the following convention: mc_q#. I'm trying the following code, but all it does is generate a plot called px and then stop running:

for (x in 1:13) {
px <- ggplot(tct_tqi, 
             aes(x = mc_qx, 
                 fill = test_category)) + 
  geom_bar(position = "fill") +
  labs(fill="TCT mark band")
}

Will be grateful for any help!!

Ronak Shah · Accepted Answer · 2021-12-29 08:49:02Z

2

You may create a list of plots -

library(ggplot2)

variables <- paste0('mc_q', 1:13)
result_px <- vector('list', length(variables))

for (i in seq_along(variables)) {
  result_px[[i]] <- ggplot(tct_tqi, 
            aes(x = .data[[variables[i]]], fill = test_category)) + 
    geom_bar(position = "fill") +
    labs(fill="TCT mark band")
}

result_px[[1]] would return the 1st plot, result_px[[2]] the 2nd plot and so on.

answered Dec 29, 2021 at 8:49

Ronak Shah

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