[R] R and emacs

[pir2.jv]

I wrote a "program"  truc.r with emacs
In emacs, I start the buffer R, then I eval the buffer truc.r (C-c C-b)
All is correct and I have my results.

But, when I return to Console R, and make:
 > source ("truc.r"), I obtain an error:
Erreur dans source("truc.r") :
   invalid multibyte character in parser at line 1

If I copy, line by line the instructions of the emacs buffer and put  
them in R console, all is correct.
  ????

Thanks




Jacques Vernin