mk_subgroup_shuffling_function function

Created a shuffling function that permutes samples within certain subgroups of the container locations

If length(n_swaps)==1, the returned function may be called an arbitrary number of times. If length(n_swaps)>1 the returned function may be called length(n_swaps) timed before returning NULL, which would be the stopping criterion if all requested swaps have been exhausted.

mk_subgroup_shuffling_function(
  subgroup_vars,
  restrain_on_subgroup_levels = c(),
  n_swaps = 1
)

Arguments

• subgroup_vars: Column names of the variables that together define the relevant subgroups
• restrain_on_subgroup_levels: Permutations can be forced to take place only within a level of the factor of the subgrouping variable. In this case, the user must pass only one subgrouping variable and a number of levels that together define the permuted subgroup.
• n_swaps: Vector with number of swaps to be proposed in successive calls to the returned function (each value should be in valid range from 1..floor(n_locations/2))

Returns

Function to return a list with length n vectors src and dst, denoting source and destination index for the swap operation, or NULL if the user provided a defined protocol for the number of swaps and the last iteration has been reached

Examples

set.seed(42)

bc <- BatchContainer$new(
  dimensions = c(
    plate = 2,
    row = 4, col = 4
  )
)

bc <- assign_in_order(bc, samples = tibble::tibble(
  Group = c(rep(c("Grp 1", "Grp 2", "Grp 3", "Grp 4"), each = 8)),
  ID = 1:32
))

# here we use a 2-step approach:
# 1. Assign samples to plates.
# 2. Arrange samples within plates.

# overview of sample assagnment before optimization
plot_plate(bc,
  plate = plate, row = row, column = col, .color = Group
)

# Step 1, assign samples to plates
scoring_f <- osat_score_generator(
  batch_vars = c("plate"), feature_vars = c("Group")
)
bc <- optimize_design(
  bc,
  scoring = scoring_f,
  max_iter = 10, # the real number of iterations should be bigger
  n_shuffle = 2,
  quiet = TRUE
)
plot_plate(
  bc,
  plate = plate, row = row, column = col, .color = Group
)

# Step 2, distribute samples within plates
scoring_f <- mk_plate_scoring_functions(
  bc,
  plate = "plate", row = "row", column = "col", group = "Group"
)
bc <- optimize_design(
  bc,
  scoring = scoring_f,
  max_iter = 50,
  shuffle_proposal_func = mk_subgroup_shuffling_function(subgroup_vars = c("plate")),
  aggregate_scores_func = L2s_norm,
  quiet = TRUE
)
plot_plate(bc,
  plate = plate, row = row, column = col, .color = Group
)