Re: Simple one

Ben Bolker wrote:

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))