CODEWITHSUNDEEP
rlistdataframe
SF1
SF1

Reputation: 469

access elements of dataframes in list?

I'm new to R, trying to understand how to access elements of my dataframe when I add them to a list.

I can access the elements of the dataframe normally but can't do the same when I add the dataframe to the list. How can I do it? Thanks

abc <- rbind(presence[2,], presence[6,], presence[9,])
bca <- rbind(presence[5,], presence[7,], presence[10,])
cab <- rbind(presence[4,], presence[8,], presence[12,])

abc[1,7] #works

sets <- list(abc, bca, cab)
sets$abc[1,7] #returns NULL

Upvotes: 1

Views: 74

Answers (1)

akrun
akrun

Reputation: 887118

There is no

sets$abc

as the list is unnamed

We need to name it

names(sets) <- c('abc', 'bca', 'cab')

Or when creating the list use

sets <- list(abc = abc, bca = bca, cab = cab)

With purrr, the naming is automatically done with lst

sets <- purrr::lst(abc, bca, cab)

Or use dplyr::lst

sets <-  dplyr::lst(abc, bca, cba)

Instead of extracting each element one by one, this can be also done with lapply/sapply

lapply(sets, `[`, 1, 7)

Or with sapply to return a vector

sapply(sets, `[`, 1, 7)

Upvotes: 2

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