Convert a long dataframe to a wide (sparse) matrix

An alias for tidytext::cast_sparse

Usage

build_matrix(data, row, column, value, ..., sparse = TRUE)

Arguments

data: Dataframe
row: Column name to use as row names, as string or symbol
column: Column name to use as column names, as string or symbol
value: Column name to use as matrix values, as string or symbol
...: Other arguments, passed to Matrix::sparseMatrix
sparse: Should the matrix be a Matrix sparse matrix?

Value

A matrix or sparse Matrix object, with one row for each unique value in the row column, one column for each unique value in the column column, and with as many non-zero values as there are rows in data.

Examples

data.frame(id = c(1, 1, 2, 2) + 4,
           cols = c('a', 'b', 'a', 'b'),
           vals = 1:4) |>
    build_matrix(row = id, column = 'cols', value = vals)
#> 2 x 2 sparse Matrix of class "dgCMatrix"
#>   a b
#> 5 1 2
#> 6 3 4