README.md

In andrie/version.compare: Compares the Results of Running Code in Different Installed Versions of R

Compare the results of R code running in different installed versions of R

Objective:

• To compare results (and execution speed) of a script running in different installed versions of R
• This is done by using RScript and diverting output to temp files

Exported functions

• findRscript()

  • Finds installed versions of R on a machine, by searching for Rscript in typical installation folders

• version.time()

  • Similar to system.time() in base R, takes an expression as input and runs this expression in multiple installations of R on the same machine
  • Returns results as well as system.time() for each installed version.

Example

This example runs a simple script in two different installations of R.

# Find installed versions of Rscript

rscript <- findRscript()


# Configure which installed version to use

rscript <- switch(
  Sys.info()[["sysname"]],
  Windows = c(
    "c:/program files/RRO/R-3.1.1/bin/x64/Rscript.exe",
    "c:/program files/R/R-3.1.1/bin/x64/Rscript.exe"
  ),
  Linux = c(
    "/usr/lib64/RRO-8.0/R-3.1.1/lib/R/bin/Rscript",
    "/usr/lib/R/bin/Rscript"
  )
)

# Compute vector mean in different R installations

version.time({
  foo <- rnorm(1e6)
  mean(foo)
} , rscript)


# Compute matrix cross product in different R installations

version.time({
  m <- matrix(runif(100), nrow=10)
  crossprod(m)
} , rscript)

View the vignette

You can see the package vignette at https://htmlpreview.github.io/?https://github.com/andrie/version.compare/blob/master/inst/doc/version.compare.html

andrie/version.compare documentation built on May 10, 2019, 11:42 a.m.