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Sum two variables
For whatever reason, if you sum two variables var1 and var2 from df, you might get the following error: Non-numeric argument to binary operator.
To circumvent it, just be sure that both variables are numeric within the sum:
df$var3 <- as.numeric(as.character(df$var1)) + as.numeric(as.character(df$var2))
By “within the sum”, I mean you need to write this in one single line. If you break it in two or three lines, it won’t work ¯\_(ツ)_/¯