[BioC] duplicatecorrelations

[David martin]

Hello,
I have an array where all printed spots are duplicate. I also have 
duplicated controls per array block.
In total 32 block tant contains each time 2 probes of the same control. 
For the rest of the array all the other printed spots are duplicated once.

Every time probes are next to each other.

I apply the following function:
corfit <- duplicateCorrelation(mat, design, ndups=2)

it seems to work properly but i'm not sure how my controls are handled ?