is there a way in R to merge rows that have the same ID?

Question

enter image description here I have a dataframe that has several rows with the same ID and columns 1 to 1273 (please see image). I would like to merge all the rows with the same ID.

I tried this R code (attached image - I can't seem to add my code in text) enter image description here :

This did not exactly work for me because I was expecting to see the attached image enter image description here . Could I please get some assistance with this, I would greatly appreciate it.

Answer 1

This should work for you. df %>% group_by(sample)%>% summarise(across(starts_with("a"), ~sum(., na.rm = T)))

taken from this post: R: Combine rows with same ID