[R] beginner's loop issue

aledanda danda.galli at gmail.com
Tue Mar 13 17:27:41 CET 2012

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


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