id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,cpu,platform 2986,r.mapcalc with same variable on LHS and RHS,mankoff,grass-dev@…,"It appears the following is valid syntax: {{{ r.mapcalc ""x = x + 1"" --o }}} But a GRASS developer has said ([http://gis.stackexchange.com/a/109763/609 source]), {{{ Note that you shouldn't use r.mapcalc like this (read from and write in the same map): r.mapcalc ""old = old + 10"" --overwrite }}} If this is the case, this seems like it **important** and should be included in the documentation. ",defect,closed,major,7.0.4,Docs,7.0.3,fixed,r.mapcalc,mankoff@…,Unspecified,Unspecified