[R] Simple one

[Ben Bolker]

JoK LoQ wrote:
> 
> Just a quickly beginner's question. 
> 
> I wanna find the mean only from the values from a column related to
> specific values from another one. Like, theres a 'region' column, i want
> the mean of the value on 'profit' column only from "south" sells from
> 'region' column
> 

mean(x[x$region=="south",]$profit)

or  (untested)

mean(subset(x,region=="south",select=profit))
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