Adding on Michael comment:
If your trap all conditions that render your main code invalid at the
beginning of your code, the main code does not have to be within the "else"
part of a if else statement.
For instance:
myf <- function(a,b,c){
if ( ! (is.numeric(a) && (a>=0 & a<=1) ) ){
stop('a is invalid')
}
if (<all bad conditions for b>){
stop('b is invalid')
}
if (<all bad conditions for c>){
stop('c is invalid')
}
return(a+b+c)
}
Sebastien
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