Storing loop output in a dataframe in R

Question

I want to know how to store the values of the complete loop output into a single dataframe in R. For example,

for(i in unique(x$id)){
    .
    .
    .
    y=output of one iteration}

At the end of each iteration, I am getting the output in y. But I want to store output of all iterations into y. How do I do that in R?

Answer 1

You can do this simply by

y  <- NULL;
for (i in unique(x$id))
 { 
  tmp <- [output of one iteration]
  y <- rbind(y, tmp)
 }