# NOT RUN {
# Two factors, both with two levels.
# The evaluation function simply prints out the combination
cc <- ffexp$new(a=1:2,b=c("A","B"),
eval_func=function(...) {c(...)})
# View the factor settings it will run (each row).
cc$rungrid
# Evaluate all four settings
cc$run_all()
cc <- ffexp$new(a=1:3,b=2, cd=data.frame(c=3:4,d=5:6),
eval_func=function(...) {list(...)})
# }
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