Specify the units to cross to index a new unit

crossed_by(A, B) is the same as ~A:B but crossed_by offers more control over the names of the new units as well as adding new attributes.

Usage

crossed_by(
  ...,
  prefix = NULL,
  suffix = NULL,
  leading0 = NULL,
  sep = NULL,
  attrs = NULL
)

Arguments

...

a sequence of units

prefix

Currently not implemented.The prefix of the label.

suffix

Currently not implemented.The suffix of the label.

leading0

Currently not implemented.Whether there should be a leading 0 if labels are made.

sep

Currently not implemented.A separator added between prefix and the number if prefix is empty.

attrs

Currently not implemented.

Value

An object of class "cross_lvls".

Examples

design("Strip-Plot Design | Strip-Unit Design") %>%
  set_units(block = 3,
            row = nested_in(block, 7),
            col = nested_in(block, 6),
            unit = nested_in(block, crossed_by(row, col)))
#> Strip-Plot Design | Strip-Unit Design
#> └─block (3 levels)
#>   ├─row (21 levels)
#>   │ └─unit (126 levels)
#>   ├─col (18 levels)
#>   │ └─unit (126 levels)
#>   └─unit (126 levels)