tablec: Fast C++ tabulation.

In traversc/trqwe: Performance oriented statistical metrics and utility functions.

Description

Takes in a character, integer or factor vector and tabulates the number of times each element appears.

Usage

tablec(x, sort = F)

Arguments

x	A character, integer or factor vector. NAs are allowed.
sort	TRUE if the result names should be sorted alphanumerically.

Value

A integer vector of counts of each element.

Examples

x <- factor(sample(1e5, 1e8, replace=T))
microbenchmark(table(x), tablec(x), times=3)

Unit: milliseconds
     expr       min         lq       mean    median         uq        max
 table(x) 9777.6457 10479.0949 10717.3382 11180.544 11187.1844 11193.8246
tablec(x)  678.0364   685.9467   713.1181   693.857   730.6589   767.4608


x <- sample(letters, 1e8, replace=T)
microbenchmark(table(x), tablec(x), tablec(x,sort=T), times=3)

Unit: seconds
               expr      min       lq     mean   median       uq      max
           table(x) 5.778514 5.829125 5.855560 5.879737 5.894083 5.908430
          tablec(x) 1.589360 1.589381 1.589516 1.589402 1.589594 1.589786
tablec(x, sort = T) 1.589386 1.590520 1.591824 1.591655 1.593044 1.594432

traversc/trqwe documentation built on Dec. 4, 2020, 4:21 a.m.