r - when to omit comma separators -


cofv<- function(x) sd(x)/mean(x) there no comma in argument, , 1 thing confuses me: there comma separate arguments, there isn’t. how determined whether need comma?

there 1 argument, 'x'. need show other examples there commas don't understand. function written:

cofv<- function(x) {           sd(x)/mean(x) }

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