[R] what is the difference between the function "expand.grid" and "data.frame"?

Hello everyone, i found that both of the 2 functions ("expand.grid" and "data.frame") can be used to produce data frame. are there any difference between them? thanks for your help! zhaoran [[alternative HTML version deleted]] __ R-help@r-pro

[R] are there any package for clustering the microarray data?

Hello, i just begin to study R language. And now i need to do clustering analysis of some data from microarray experiments. are there any good package for doing that? If i get the clustering results, how can i get a matrix or list of all the members of a certain cluster? thanks! zhaoran