[BioC] limma normalization warning

[yjzhang@uiuc.edu]

I am using limma normalizeWithinArrays with method 
="robustspline" and other default settings. I got the 
following warning: rlm failed to converge in 20 steps in: 
rlm.default(x, y, weights = w, method = method).

I googled and found someone solved the problem by increasing 
the parameter "maxit". When I tried to pass "maxit=21", I 
got an error message: "unused argument(s) (maxit ...)".

YJ Zhang