[R] beginner's loop issue

[aledanda]

Dear All,

I hope you don't mind helping me with this small issue. I haven't been using
R in years and I'm trying to fill in a matrix 
with the output of a function (I'm probably using the Matlab logic here and
it's not working). 
Here is my code:

for (i in 1:length(input)){
  out[i,1:3] <- MyFunction(input[i,1],input[i,2], input[i,3]) 
    out[i,4:6] <- MyFunction(input[i,5],input[i,7], input[i,6]) 
      out[i,7:9] <- MyFunction(input[i,8],input[i,10], input[i,9]) 
}

'input' is a matrix 
> dim(input)
[1] 46 10

and each raw corresponds to a different subject. 
The error I get here is

/Error in out[i, 1:3] <- get.vaTer(input[i, 2], input[i, 4], input[i, 3],  : 
  object 'out' not found/

So I wonder, what's wrong in the assignment to the variable out? 
Should I define the variable before the loop?

Thanks for your help
Best

Ale

--
View this message in context: http://r.789695.n4.nabble.com/beginner-s-loop-issue-tp4469514p4469514.html
Sent from the R help mailing list archive at Nabble.com.