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Hi, I'm preetty new to R and seem to be having difficulties with writing a function that would change an array and keep the change after the function finishes its work. in other words I have an array of 1's X<-array(1,dim=c(2,2)) I want to add a number to X[1,1] by means of a function called addition. What I am writing is: addition<-function(a){X[1,1]=X[1,1}+a} but it