non-numeric argument to binary operator when using apply on a numeric dataframe

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I have the dataframe DATA1 as shown for a few rows:

structure(list(S = c(12, 12, 15, 15, 15, 9, 9), UG = c(84, 84, 
84, 84, 84, 84, 84), CSi = c(0.48718144148


                      
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