extract.fun: Extract functions, libraries and global variables to be loaded onto a compute cluster

Description

Automatic extraction of functions, libraries and global variables employed passed functions. Designed for peperr call, see Details section there.

Usage

extract.fun(funs = NULL)

Arguments

funs

list of function names.

Value

list containing

packages

vector containing quoted names of libraries

functions

vector containing quoted names of functions

variables

vector containing quoted names of global variables

Details

This function is necessary for compute cluster situations where for computation on nodes required functions, libraries and variables have to be loaded explicitly on each node. Avoids loading of whole global environment which might include the unnecessary loading of huge data sets.

It might have problems in some cases, especially it is not able to extract the library of a function that has no namespace. Similarly, it can only extract a required library if it is loaded, or if the function contains a require or library call.

Examples

Run this code

# NOT RUN {
# 1. Simplified example for illustration
# }
# NOT RUN {
library(CoxBoost)
a <- function(){
# some calculation
}

b<-function(){
# some other calculation
x <- cv.CoxBoost()
# z is global variable
y <- a(z)
}

# list with packages, functions and variables required for b:
extract.fun(list(b))

# 2. As called by default in peperr example
extract.fun(list(fit.CoxBoost, aggregation.pmpec))
# }