Create a cross product of lists — expand

This function creates a cross product of multiple lists, similar to tidyr::expand_grid() but with a more convenient interface that doesn't require wrapping arguments in an extra list(). It's useful for generating combinations of parameters for analysis.

expand_list(...)

Arguments

...: Named arguments, each containing a vector or list of values to combine

Value

A list of lists, where each inner list contains one combination of values from the input arguments

Examples

# Create combinations of parameters
combinations <- plnr::expand_list(
  a = 1:2,
  b = c("a", "b")
)

# View the combinations
str(combinations)
#> List of 4
#>  $ :List of 2
#>   ..$ a: int 1
#>   ..$ b: chr "a"
#>  $ :List of 2
#>   ..$ a: int 1
#>   ..$ b: chr "b"
#>  $ :List of 2
#>   ..$ a: int 2
#>   ..$ b: chr "a"
#>  $ :List of 2
#>   ..$ a: int 2
#>   ..$ b: chr "b"

# Compare with tidyr::expand_grid
tidyr::expand_grid(list(
  a = 1:2,
  b = c("a", "b")
))
#> # A tibble: 2 × 1
#>   `list(a = 1:2, b = c("a", "b"))`
#>   <named list>                    
#> 1 <int [2]>                       
#> 2 <chr [2]>