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Split a Design into One Grid Index per Grid

Source: R/design_utils.R
grid_indices.Rd

The multi-grid counterpart of grid_index(). A multi-environment trial is several grids that share a treatment set and never share an edge, so it cannot be one matrix: sites reuse row/col, and pooling them either silently overwrites plots or invents adjacencies between sites.

With by = NULL this returns a one-element list, so callers have a single code path whether or not the design spans grids.

Usage

grid_indices(df, row_column = "row", col_column = "col", by = NULL)

Arguments

df

A data frame with columns named by row_column and col_column.

row_column

Column name of the row position variable (default "row").

col_column

Column name of the column position variable (default "col").

by

Optional column name grouping plots into grids (e.g. "site"). NULL treats the design as one grid.

Value

A named list with one element per grid, each a list of rows (the positions in df belonging to that grid) and index (that grid's grid_index()). Named "1" when by is NULL.