GUIProfiler-package {GUIProfiler}

Graphical User Interface for Rprof()

Description

Show graphically the results of profiling R functions by tracking their execution time.

Details

Package:	GUIProfiler
Type:	Package
Version:	2.0.1
Date:	2015-08-23
License:	GPL

This package mimics the behavior of the Matlab profiler: after the code in a file is executed, it is generated an HTML report. This HTML report includes information on the time spent on each of the lines of the profiled code and hyperlinks to jump across the included functions. The graphical interface makes it easy to identify which are the specific lines that may slow down the code.

Author(s)

Fernando de Villar and Angel Rubio

Maintainer: Fernando de Villar <[e-mail]>

See Also

RRprofStart, RRprofStop, RRprofReport, Rprof

Examples

temp<-tempdir()
# Definition of two functions
normal.solve <- function(A,b) {
  Output <- solve(crossprod(A), t(A)%*%b)
}

chol.solve <- function(A,b) {
  L <- chol(crossprod(A))
  Output1 <- backsolve(L, t(A)%*%b, transpose=TRUE)
  Output2 <- backsolve(L, Output1)
}

compareMethods <- function() {
  library(MASS)
  # Call the functions
  source(paste(temp,"/normal.solve.R",sep=""))
  source(paste(temp,"/chol.solve.R",sep=""))
  # Solving a big system of equations
  nrows <- 1000
  ncols <- 500
  A <- matrix(rnorm(nrows*ncols),nrows,ncols)
  b <- rnorm(nrows)
  # Testing different possibilities
  Sol1 <- qr.solve(A,b) # Using QR factorization
  Sol2 <- coefficients(lm.fit(A,b)) # lm.fit, based on QR but with some overhead
  Sol3 <- ginv(A) %*% b # Using the pseudoinverse based on SVD
  Sol4 <- normal.solve(A,b) # Using a function based on the normal equations.
  Sol5 <- chol.solve(A,b) # Using a function based on the Choleski factorization.
}

# Dump these functions to three different files

dump("normal.solve",file=paste(temp,"/normal.solve.R",sep=""))
dump("chol.solve",file=paste(temp,"/chol.solve.R",sep=""))
dump("compareMethods",file=paste(temp,"/compareMethods.R",sep=""))
source(paste(temp,"/compareMethods.R",sep=""))

# Profile the code

RRprofStart()
compareMethods()
RRprofStop()
# Uncomment to open the report
#RRprofReport()