[R] Finding and changing .Rprofile

[philipsm]

I would like to change my .Rprofile file, but I cannot find it. I use  
a Mac Pro and RStudio. I believe the file is a hidden file and I have  
checked for it accordingly. I can not find it with a Spotlight search.  
It is not in my "default working directory". Is that the same thing as  
my "home directory"? I believe I can put a new .Rprofile file in any  
project directory, but that is not what I want to do. I want a  
.Rprofile file that will apply automatically whenever I start working  
on another project. Was one installed automatically when I installed R  
and RStudio many months ago and if so, where can I find it? If it was  
not installed automatically and I have to create my own, where should  
I put it?

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