How to load all my functions in my project automatically in R

Question

I am writing more than 6 functions and save them in my R.project. Every time, to start working using my project, I need to run each function manually one by one. Is there a way that I can load all these functions automatically?

Answer 1

You have two options:

1. Create your own package and load it on the start-up, you will have all the function available. A tutorial

2. Customize R start-up loading automatically your R files containing your functions. A tutorial and an example

Answer 2

We can create a package in R

1. Bundle the functions and create a package - yourpackage and then load the package

    library(yourpackage) 

2. One example is here

3. Another resource is here

4. Yet another is here

Answer 3

If you don't wish to take the package approach (which I agree is the best approach), you could stack all your functions on top of one another in an R script and source it on startup. One step instead of 6. End up with all the functions in your .GlobalEnv

Put this in an R script:

###Put in a script
eeee <- function(){
  cat("yay I'm a function")
}


ffff <- function(){
  cat("Aaaaaah a talking function")
}

If you use RStudio, the code would be as below. Otherwise change the source location. Do this in console (or in a script):

###Do this
source('~/.active-rstudio-document')

Then you can do:

eeee()
yay I'm a function

ffff()
Aaaaaah a talking function

Answer 4

You can run the below script before starting your work:

source_code_dir <- "./R/"  #The directory where all source code files are saved.
file_path_vec <- list.files(source_code_dir, full.names = T)
for(f_path in file_path_vec){source(f_path)}