logic: Logical operators for selection objects
In CALIBERcodelists: Generate ICD10, Read and OPCS codelists

Description Usage Arguments Value See Also Examples

%OR% is a version of | (the OR binary operator) which automatically invokes as.selection to coerce its argument to a selection (e.g. a character string is used by termhas to select terms).

%AND% is a version of & (the AND binary operator) which acts similarly, and NOT is a function which converts its argument to a selection and then negates it.

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cond1 %OR% cond2
cond1 %AND% cond2
NOT(cond1)

`cond1`	a selection object, or a character string which will be converted to a selection using `termhas`
`cond2`	another selection object or character string

A selection object.

S3 Boolean operators for codelist objects: !.selection, |.selection, &.selection

setdictionary('icd10')
as.selection('angina') %OR% as.selection('myocardial infarction')
my1 <- as.selection('angina')  %AND% as.selection('unstable')
my2 <- 'angina' %AND% 'unstable'
identical(my1, my2)
'angina' %AND% NOT('unstable')