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Adds the axial points to a $2^n$ centered factorial plan.
fp_augment_axial(dm, rep = 1)
A central composite design (a factorial.plan object).
factorial.plan
A factorial plan table, with central points.
The number of replications.
fp_design_matrix(3) %>% fp_augment_center(rep=4) %>% fp_augment_axial()
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