Help writing functions

[lilyhav]

Hi, I am learning to use R, working through an Intro to R book to get a handle on the software. One of the exercises I have to work through is writing functions, and I need to write a function for the area of a circle. This is the function I used & the function that is supposedly correct according to the exercise:
circle.area<-function(d){
pi*(d/2)^2
}
However, I keep getting an error message back that the object 'd' is not found. It is simply supposed to be a variable for diameter, to which values can be inserted. How do I specify that, or define d as a variable? I also tried defining d as "diameter" but it didn't work for some of the more complex equations I have to use this function for.

[nwerth]

Can you share the command you run that raises the error? Your function works, so the error's probably coming from somewhere else.

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