How to use a function without first running the function script first?

Question

This may be a silly question as I am new to R. I wrote a function that sums the square of two inputs. but I can't figure out how to directly use the function every time I open R without first running the function's script. Any help is appreciated.

sum.of.squares <- function(x,y) {
  x^2 + y^2
}

stat.ethz.ch/R-manual/R-devel/library/base/html/Startup.html — user3710546
– user3710546, Commented Feb 1, 2016 at 5:31

saladi · Accepted Answer · 2016-02-01 10:44:44Z

1

You can do a couple things:

Include this function in your Rprofile file (See here)
Save an image of your environment as .RData (See here). Whenever you start an R session from that directory, the .Rdata file with the function will be loaded.

answered Feb 1, 2016 at 10:44

saladi

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2 Comments

saladi Over a year ago

Can you explain? I often have helper functions saved as part of my R environment that I don't want to be loaded globally between different projects (that all use the same R binary).

Ben Bolker Over a year ago

Storing stuff in your environment means it's hard to see what's there (outside of R) and hard to document. Better to put helper functions into .R files and source() them -- or write a package, once they get complicated.

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