fastIntToString: Fast convert integer vector to character vector

In jwutil: Tools for Data Manipulation and Testing

Description

Fast conversion from integer vector to character vector using C++

Usage

fastIntToStringStd(x)

Arguments

x	vector of integers
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 <- generate_random_pts(1e7)
# conclusion: buffer size matters little (so default to be more generous),
# and Rcpp version fastest.
microbenchmark::microbenchmark(fastIntToStringStd(pts$visit_id, buffer = 8),
                               fastIntToStringStd(pts$visit_id, buffer = 16),
                               fastIntToStringStd(pts$visit_id, buffer = 64),
                               fastIntToStringRcpp(pts$visit_id, buffer = 8),
                               fastIntToStringRcpp(pts$visit_id, buffer = 16),
                               fastIntToStringRcpp(pts$visit_id, buffer = 64),
                               as.character(pts$visit_id),
                               as_char_no_warn(pts$visit_id), times = 5)

## End(Not run)

jwutil documentation built on May 7, 2019, 1:03 a.m.