num2char: Convert a column number to a word representation
In ABohynDOE/mldoeR: Catalog of mixed four-and-two-level regular designs

Description Usage Arguments Details Value Examples

View source: R/generators.R

'num2char' represents a column number as its corresponding generator.

1	num2char(x)

`x`	Number of the interaction

Column number are always positive, non-zero integers. Basic factors are power of two, while added factors are decomposed in powers of two and their corresponding generator is build from it. A generator corresponds to the basic factors used to create the levels of the added factor. All basic factors are represented by independent lowercase letters.

A character of length larger or equal to one, corresponding to a generator. For any number n, the length of the character will always be ceil(log2(n)).