Prof Brian,

Thanks for the reply. My mistake its "clRes" in place of "result"

> chrcomb <- sapply(clRes, function(x) rbind(x))
Error in rbind(x) : no method for coercing this S4 class to a vector

I think what you mentioned about the package forgetting to import an S4
generic for rbind seems the logical explanation of this problem.

Thanks,
Kamal

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