[ESS] mapping Ctrl-r to comint-next-input

[Hans Ekbrand]

I am used to (from BASH, and the native R shell) pressing Ctrl-p to
get the last item in the history copied to the current line. In ESS
this function (comint-previous-input) is mapped to Ctrl-up. What do I
need in my .emacs to change the binding from Ctrl-up to Ctrl-p?

-- 
Hans Ekbrand (http://sociologi.cjb.net) <hans at sociologi.cjb.net>
A. Because it breaks the logical sequence of discussion
Q. Why is top posting bad?