Examples of profiling R code

August 1, 2012

(This article was first published on blog.RDataMining.com, and kindly contributed to R-bloggers)

by Yanchang Zhao, RDataMining.com

Below are simple examples of profiling R code, which help to find out which steps or functions are most time consuming. It is very useful for improving efficiency of R code.

# profiling of running time
y <- myFunction(x)  # this is the function to profile

The example below profiles memory as well. Memory allocation can also be profiled with function Rprofmem().

# profiling of both time and memory
Rprof(“myFunction.out”, memory.profiling=T)
y <- myFunction(x)
summaryRprof(“myFunction.out”, memory=”both”)

A detailed example of profiling R code can be found at http://www.stat.berkeley.edu/~nolan/stat133/Fall05/lectures/profilingEx.html.

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