conf.design - Construct a single replicate symmetric factorial design.

conf.set - For a set of defining contrasts of a confounding scheme.

direct.sum - Constructs the direct sum of two or more designs.

join - Combine two or more factors into a single factor defining the subclasses.

rjoin - join two or more designs into a single design by row concatenation.


factorize - Generic function.  The "default" method factorizes positive numeric integer arguments, returning a vector of prime factors.

primes - Generate all prime numbers less than its (scalar) argument, n.
