How to realize rowSum with collapse::?

General
1

How to realize rowSum with collapse?
ret$mitNachA <-mitNachA %>% dplyr::mutate(sumVar=rowSums(.[2:51]))
ret$mitNachB <-mitNachB %>% dplyr::mutate(sumVar=rowSums(.[2:13]))

2

It would be easier to help if you posted some example data and the expected results, as described here.

3

and what is collapse ?

4

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