icd9 (version 0.5)

icd9IsVE: is the given code V or E type?

Description

quickly find V or E codes, without fully validating V or E codes. Use fixed instead of regex for speed. Don't check position of V or E: this is not validation, just a quick classification of pre-validated codes. TODO: this doesn't look efficient, but can't use fixed with ignore case, and regex slower.

Usage

icd9IsVE(icd9)

Arguments

icd9

is a character vector of ICD-9 codes. If fewer than five characters is given in a code, then the digits are greedily assigned to hundreds, then tens, then units, before the decimal parts. E.g. "10" becomes "010", not "0010"

Examples

# regex is a little faster
icd9 <- rep(times = 500, c("1", "not", "V10.0", " E950", ""))
microbenchmark(times = 1000,
  grepl(pattern = "E", icd9, fixed = TRUE) |
  grepl(pattern = "e", icd9, fixed = TRUE) |
  grepl(pattern = "V", icd9, fixed = TRUE) |
  grepl(pattern = "v", icd9, fixed = TRUE))
microbenchmark(times = 1000, grepl(pattern = "[EeVv]", rnd))