Used two syntaxes none of them worked.
1)
df_final$concat <- paste(df_final$A,df_final$B,df_final$C,sep="/")
Error - no method for coercing this S4 class to a vector
2)
df_final$concat <- (df_final$A + "/" + df_final$B)
Error - This returned nulls. Any help would be appreciated. All of the columns contain strings.
You can use the following syntax.
df_final$concat <- concat_ws(df_final$A,df_final$B,df_final$C,sep="/")