search for: var_that_does_not_exist

Dear list, I have a question and I'm going to give an example of my problem f<- function(d1, d2, d3) { d<- d1*d2/d3 return(d) } v1<- 1 v2<- 2 If I try f(v1, v2, v3) Error in f(v1, v2, v3) : object "v3" not found I obviously got the above error message. I would like to add something to my function to allow me to get a certain value (say zero) if one of the arguments is