R assigning ggplot objects to list in loop

Question

I\'m using a for loop to assign ggplots to a list, which is then passed to plot_grid() (package cowplot). plot_grid

Answer 1

There is a nice explanation of what happens with ggplot2's lazy evaluation and for loops in [this answer](https://stackoverflow.com/a/26246791/2461552.

I usually switch to aes_string or aes_ for situations like this so I can use variables as strings in ggplot2.

I find lapply loops easier than a for loop in your case as initializing the list and using the counter can be avoided.

First, I add the x variable to the dataset.

dfrm$index = 1:nrow(dfrm)

Now, the lapply loop, looping through the columns in v.

myplots = lapply(v, function(x) {
    ggplot(dfrm, aes_string(x = "index", y = x)) + 
        geom_point() +
        labs(y = x)
})

plot_grid(plotlist = myplots)