Function writing
3 important questions on Function writing
How do you use the if() function in a function?
- func<-function(x){ #start of body
- if(specification){ #start of specification
- return(desired result)
- }#end of specification
- else(second specification){ #start of specification
- return(desired result)
- }#end of specification
- } #end of function
How can you make custom warnings and errors in your function?
- If(specification) {
- stop("error message")
- }
- this will cause the function to stop and the error message to arise
- If(specification) {
- warning("warning message")
- }
- this will spawn a warning message, but the code will run on.
What does it mean to say that a function doesn't influence the global environment?
Using the undefined value x in your function and then asking for a result using function(1) does not alter x if x was earlier in your coding a pre existing value.
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