Define all functions in one .R file, call them from another .R file. How, if possible?

Question

How do I call functions defined in abc.R file in another file, say xyz.R?

A supplementary question is, how do I call functions defined in abc.R from the R prompt/command line?

Answer 1

You can call source("abc.R") followed by source("xyz.R") (assuming that both these files are in your current working directory.

If abc.R is:

fooABC <- function(x) {     k <- x+1     return(k) } 

and xyz.R is:

fooXYZ <- function(x) {     k <- fooABC(x)+1     return(k) } 

then this will work:

> source("abc.R") > source("xyz.R") > fooXYZ(3) [1] 5 >  

Even if there are cyclical dependencies, this will work.

E.g. If abc.R is this:

fooABC <- function(x) {     k <- barXYZ(x)+1     return(k) }  barABC <- function(x){     k <- x+30     return(k) } 

and xyz.R is this:

fooXYZ <- function(x) {     k <- fooABC(x)+1     return(k) }  barXYZ <- function(x){     k <- barABC(x)+20     return(k) } 

then,

> source("abc.R") > source("xyz.R") > fooXYZ(3)  [1] 55 >