make_scale_regex: Build conceptual scale based on pattern matching
In corybrunson/context: Produce formal contexts (binary matrices) from data

Description Usage Arguments Value Examples

Build conceptual scale based on pattern matching

1	make_scale_regex(objs, patterns, split)

`objs`	Vector (usually character or factor).
`patterns`	Character vector of regular expressions. Each attribute of the resulting context amounts to `grepl(x = objs, pattern = pattern)` for some `pattern` in `patterns`.
`split`	Character. Regular expression used to split `objs` into `patterns`, if `patterns` is not provided.

A binary matrix (formal context).

# state name modifiers
make_scale_regex(objs = state.name,
                 patterns = c("^New", "^(North|South|East|West)"))

# letters in state names
make_scale_regex(objs = state.abb, split = "")