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Sharyl, if you don't have to many catagories I suggust using r.infer, that is working fine as far as I know
You should make a script like
IFMAP orginal_map 1
THENMAPHYP 5 categoryname

run the command with    r.infer rulesfile=scriptname
the output will be a map that is named infer so use g.rename to change the name 


***********************************************
*             Ronnie Lassche                  *
*       Department of earth sciences          *
*              Free University                *
*                 Amsterdam                   *
*               lasm@geo.vu.nl                *
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***********************************************
*             Ronnie Lassche                  *
*       Department of earth sciences          *
*              Free University                *
*                 Amsterdam                   *
*               lasm@geo.vu.nl                *
***********************************************

