cat file for r.mapcalc

[Xin Zhuang]

I have two layers: left and right. They don't overlay.
I'd like to merge them together. Guess I can use
either
	new = left + right
or more safely
	new=if(left,left,right)

However, there won't be category contents for Layer "new".
Is there a way to bring category contents in Layers "left"
and "right" into Layer "new"?
Or maybe I should use another function?


Appreciate any hint and help.



zhuang at access.digex.net