How to add titles to multiple plots of data frames within a list?

Question

I am trying to create plots with ggplot for 20 data frames ("df1" - "df20") that are contained in a list called "list1". The list looks like this:

list1 <- list(df1, df2, ..., df20)

Each data frame has two columns z and y that I want to plot against each other:

I have created the following code which also works but it does not provide the plots with the respective titles from df1 to df20:

lapply(list1, function(x) 
  ggplot(data = list1$x) + 
    geom_line(mapping = aes(x = x$z, 
                          y = x$y)))

I have tried putting all names in a vector and including this vector in the code like this:

titlenames <- c(df1, df2, ..., df20)

+ ggtitle(titlenames)

but this only provides the first name for all plot.

Would appreciate any help with this as I am still quite new to R.

Not related to the title specifically, but don't put $ inside your aes — camille
– camille, Commented May 8, 2019 at 15:08

C. Braun · Accepted Answer · 2019-05-08 14:55:09Z

2

You could try using mapply (similar to lapply but takes the function first, and can iterate through more than one equal-length list/vector) with the list of data and the vector of names:

mapply(function(df, titlename) {
    ggplot(data = df) + 
        geom_line(mapping = aes(x = z, y = y)) +
        ggtitle(titlename)
}, list1, titlenames)

I find that because the format of mapply differs from lapply, it is hard to remember. The package purrr provides what I think is a cleaner alternative:

purrr::map2(list1, titlenames, function(df, titlename) {
    ggplot(data = df) + 
        geom_line(mapping = aes(x = z, y = y)) +
        ggtitle(titlename)
})

answered May 8, 2019 at 14:55

C. Braun

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1 Comment

Soph2010 Over a year ago

Awesome, thank you! The mapply function somehow did not work at first but with the purrr package everything worked smoothly.

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