CRAN-R_RefreshPart9

This post just follows the previews refresh8.

WORKING WITH LISTS

List manipulation

Example

# Vector with numerics from 1 up to 10

my_vector <- 1:10 

# Matrix with numerics from 1 up to 9

my_matrix <- matrix(1:9, ncol = 3)

# First 10 elements of the built-in data frame 'mtcars'

my_df <- mtcars[1:10,]

# Construct 'my_list' with these different elements:

my_list <- list(vec = my_vector, mat = my_matrix, df = my_df)

# The Shining string, vector, data.frame

moviename <- "The Shining"

actors <- c("Jack Nicholson","Shelley Duvall","Danny Lloyd","Scatman Crothers","Barry Nelson")

scores <- c(4.5,4.0,5.0)

sources <- c("IMDb1","IMDb2","IMDb3")

comments <- c("Best Horror Film I Have Ever Seen","A truly brilliant and scary film from Stanley Kubrick","A masterpiece of psychological horror")

reviews <- data.frame(scores, sources, comments)

# Create the list 'shining_list'

shining_list <- list(moviename = "The Shining", actors = actors, reviews = reviews)

# Define 'last_actor'

last_actor <- shining_list$actors[length(shining_list$actors)]

# Define 'second_review'

second_review <- shining_list$reviews[2,]

# We forgot something; add the year to shining_list:

shining_list_full <- c(shining_list, year = 1980)

# Have a look at shining_list_full

str(shining_list_full)