fastIntToString: fast convert integer vector to character vector

In jackwasey/icd9: Tools for Working with ICD-9 Codes, and Finding Comorbidities

Description

fast convert integer vector to character vector

Usage

fastIntToStringStd(x)

fastIntToStringRcpp(x)

Arguments

x	td::vector<int>
bufferSize	int if any input strings are longer than this number (default 16) there will be memory errors. No checks done for speed.

Examples

## Not run: 
pts <- randomPatients(1e7)
# conclusion: buffer size matters little (so default to be more generous), and Rcpp version fastest.
microbenchmark::microbenchmark(fastIntToStringStd(pts$visitId, buffer = 8),
                               fastIntToStringStd(pts$visitId, buffer = 16),
                               fastIntToStringStd(pts$visitId, buffer = 64),
                               fastIntToStringRcpp(pts$visitId, buffer = 8),
                               fastIntToStringRcpp(pts$visitId, buffer = 16),
                               fastIntToStringRcpp(pts$visitId, buffer = 64),
                               as.character(pts$visitId),
                               asCharacterNoWarn(pts$visitId), times = 5)

## End(Not run)

jackwasey/icd9 documentation built on May 18, 2019, 7:57 a.m.