subset: extract subset(s) from ICD data

In jackwasey/icd: Comorbidity Calculations and Tools for ICD-9 and ICD-10 Codes

Description

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

Usage

## S3 method for class 'icd9'
x[...]

## S3 method for class 'icd9'
x[[...]]

## S3 method for class 'icd10'
x[...]

## S3 method for class 'icd10'
x[[...]]

Arguments

x	input data with list, vector, factor, and class set to an ICD type.
...	arguments passed on to other functions

Methods (by class)

• icd9: Extract ICD-9 codes

• icd9: Extract ICD-9 codes

• icd10: Extract ICD-10 codes

• icd10: Extract ICD-10 codes

Examples

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"))

jackwasey/icd documentation built on Nov. 23, 2021, 9:56 a.m.