search for: optfct

...s. Ideally, I would wish to figure out a way to be able to choose controls, including the number of iterations, for the solver that I tell gmm() to use. Currently, the way I call the function is as follows: model.name <- gmm(g=g.fn, x=data, gradv=g.gr, t0=c(start), type=c("twostep"), optfct=c("optim") ) I also would want the gmm() function to know that I want it to pass the following control -- maxit=1500 -- to the optim solver. Unfortunately, the 'gmm' manual does not tell whether this is doable. Thanks for your help.

I have data that looks like this: > df1 group id 1 red A 2 red B 3 red C 4 blue D 5 blue E 6 blue F I want a list of the groups containing vectors with the ids. I am avoiding subset(), as it is only recommended for interactive use. Here's what I have so far: df1 <- data.frame(group=c("red", "red", "red", "blue",