Score per anime per user — user_item

Create the user_item matrix from the given data. We use `adding_row = TRUE` for the user based recommendation to be able to add the user selected data to the table

user_item_matrix(
  data = anime_with_ratings,
  adding_row = FALSE,
  row_data = NULL
)

Arguments

data	data having the user ratings per anime
adding_row	Variable that is either TRUE if you want the matrix for the user-based recommendation or FALSE if you want the matrix for the item-based recommendation
row_data	table created by the function `user_data()`

Value

Return a matrix where the x axis include the item_id and the y axis include the user_id. Each line is the score per item per user

Author

Marie Bellier, Massimo Finini, Meri Likoska, Vania Rodrigues Telo Ramos, Xavier Renger

Examples


#import datasets from the package
anime_with_ratings <-  tibble::tibble(ProjectG5::anime_with_ratings)
anime <- tibble::tibble(ProjectG5::anime)

#creation of the matrix without adding rows
x <- user_item_matrix(anime_with_ratings, adding_row = FALSE)

#not printed there output would be too long





#creation of a table to add rows, userid high on a voluntary basis

#selection of the user example
names_selected <- c("Death Note", "Naruto")
score_entered <- c(10,7)

temp_tibble <- tibble::tibble(Name = names_selected, rating = score_entered)

anime_selected <- dplyr::left_join(anime, temp_tibble, by = c("Name" = "Name"))
anime_selected <- dplyr::filter(anime_selected, Name %in% names_selected)
anime_selected <- dplyr::mutate(anime_selected, user_id = 999999999)

#creation of the matrix while adding rows
z <- user_item_matrix(anime_with_ratings, adding_row = TRUE, row_data = anime_selected)

#not printed here, output would be too long