Getting started with misc::parfor • misc

# Basic usage - single arguments
misc::parfor(function(x) x^2, 1:10)

##   |                                                                              |                                                                      |   0%  |                                                                              |=======                                                               |  10%  |                                                                              |==============                                                        |  20%  |                                                                              |=====================                                                 |  30%  |                                                                              |============================                                          |  40%  |                                                                              |===================================                                   |  50%  |                                                                              |==========================================                            |  60%  |                                                                              |=================================================                     |  70%  |                                                                              |========================================================              |  80%  |                                                                              |===============================================================       |  90%  |                                                                              |======================================================================| 100%

##  [1]   1   4   9  16  25  36  49  64  81 100

# Parallel with 2 cores
misc::parfor(function(x) x^2, 1:10, cl = 2)

##   |                                                                              |                                                                      |   0%  |                                                                              |=======                                                               |  10%  |                                                                              |==============                                                        |  20%  |                                                                              |=====================                                                 |  30%  |                                                                              |============================                                          |  40%  |                                                                              |===================================                                   |  50%  |                                                                              |==========================================                            |  60%  |                                                                              |=================================================                     |  70%  |                                                                              |========================================================              |  80%  |                                                                              |===============================================================       |  90%  |                                                                              |======================================================================| 100%

##  [1]   1   4   9  16  25  36  49  64  81 100

# Multiple arguments using do.call style
args_list <- list(list(x=1, y=2), list(x=3, y=4), list(x=5, y=6))
misc::parfor(function(x, y) x + y, args_list, use_do_call = TRUE)

##   |                                                                              |                                                                      |   0%  |                                                                              |=======================                                               |  33%  |                                                                              |===============================================                       |  67%  |                                                                              |======================================================================| 100%

## [1]  3  7 11

# With additional fixed arguments
misc::parfor(function(x, power) x^power, 1:5, power = 3)

##   |                                                                              |                                                                      |   0%  |                                                                              |==============                                                        |  20%  |                                                                              |============================                                          |  40%  |                                                                              |==========================================                            |  60%  |                                                                              |========================================================              |  80%  |                                                                              |======================================================================| 100%

## [1]   1   8  27  64 125

# With error handling
misc::parfor(function(x) if(x==3) stop("error") else x^2, 1:5, 
      errorhandling = "remove")

##   |                                                                              |                                                                      |   0%  |                                                                              |==============                                                        |  20%  |                                                                              |============================                                          |  40%  |                                                                              |==========================================                            |  60%  |                                                                              |========================================================              |  80%  |                                                                              |======================================================================| 100%

## [1]  1  4 16 25