[Solved] Row-wise sum for select columns while ignoring NAs [closed]

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Here is one way to accomplish this:

#make a data frame
df <- data.frame(a = c(1,2,3),
                 b = c(1,NA,3),
                 c = c(1,2,3))

#use rowSums on a dataframe made with each of your columns and specify na.rm = TRUE
df$mySum <- rowSums(cbind(df$a,df$b), na.rm = TRUE)

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solved Row-wise sum for select columns while ignoring NAs [closed]