Loop through data frame and variable names

Question

I am looking for a way to automate some diagrams in R using a FOR loop:

dflist <- c(\"dataframe1\", \"dataframe2\", \"dataframe3\", \"dataframe4\")

for (i in         


        

Answer 1

Based on Scott Ritchi solution, this would the reproducible example, hiding also the feedback message from lapply:

# split dataframe by condition on cars hp
f <- function() trunc(signif(mtcars$hp, 2) / 100)
dflist <- lapply(unique(f()), function(x) subset(mtcars, f() == x ))

This splits the mtcars dataframe is subsets based on the hp variable classification (0 for hp lower than 100, 1 for those in the 100's, 2 for 200's, and so on.)

And, plot it:

# use invisible to prevent the feedback message from lapply
invisible(
    lapply(dflist, function(df) {
    x2 <- df$mpg^2
    log_y <- log(df$hp)
    plot(x2, log_y)
    NULL
}))

invisible() will prevent the lapply() message:

16 
9 
6 
1 
[[1]]
NULL

[[2]]
NULL

[[3]]
NULL

[[4]]
NULL