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Generate Possible Linkages

possible_linkages.Rd

Given an obscure linkage format (having "?", e.g. "a2-?"), this function generates all possible linkages based on the format. See valid_linkages() for details.

The ranges of possible anomers, first positions, and second positions can be specified using anomer_range, pos1_range, and pos2_range.

Usage

possible_linkages(
  linkage,
  anomer_range = c("a", "b"),
  pos1_range = 1:2,
  pos2_range = 1:9,
  include_unknown = FALSE
)

Arguments

linkage

A linkage string.

anomer_range

A character vector of possible anomers. Default is c("a", "b").

pos1_range

A numeric vector of possible first positions. Default is 1:2.

pos2_range

A numeric vector of possible second positions. Default is 1:9.

include_unknown

A logical value. If TRUE, "?" will be included. Default is FALSE.

Value

A character vector of possible linkages.

See also

has_linkages(), remove_linkages(), valid_linkages()

Examples

possible_linkages("a2-?")
#> [1] "a2-1" "a2-2" "a2-3" "a2-4" "a2-5" "a2-6" "a2-7" "a2-8" "a2-9"
possible_linkages("??-2")
#> [1] "a1-2" "b1-2" "a2-2" "b2-2"
possible_linkages("a1-3")
#> [1] "a1-3"
possible_linkages("a?-?", pos1_range = 2, pos2_range = c(2, 3))
#> [1] "a2-2" "a2-3"
possible_linkages("?1-6", include_unknown = TRUE)
#> [1] "a1-6" "b1-6" "?1-6"