icd (version 3.3)

subset_icd: extract subset from ICD data

Description

exactly the same as using x[n] or x[[n]] but preserves the ICD classes in result

Usage

# S3 method for icd9
[(x, ...)
# S3 method for icd9
[[(x, ...)
# S3 method for icd10
[(x, ...)
# S3 method for icd10
[[(x, ...)

Arguments

x

input data with list, vector, factor, and class set to an ICD type.

...

arguments passed on to other functions

Examples

# NOT RUN {
x <- list(my_codes = as.icd9(c("V10.1", "441.1")))
x[1]
x[[1]]
x[[1]][2]
# subsetting a list should give the underlying data structure type,
# preserving the ICD class
stopifnot(!inherits(x[[1]], "list"))
stopifnot(!inherits(x[[1]][2], "list"))

y <- as.icd10(c("A01", "B0234"))
y[2]
y[[2]]
stopifnot(inherits(y[2], "icd10"))
stopifnot(inherits(y[[2]], "icd10"))
# }