On 18/12/2009 10:22 AM, berga...@gmail.com wrote:
Dear R community
I try to create a new operator to build a special sum of two CashFlows. (my
S4 Class)
I tried the following but this is actually not what I want.
setGeneric("++",function(e1,e2)standardGeneric("++"))
setMethod("+",signature=list("CashFlow","CashFlow"),function(e1,e2){
print("+")
})
setMethod("++",signature=list("CashFlow","CashFlow"),function(e1,e2){
print("++")
})
The problem here is that this work but it treats "++" as a general
function.. the call is "++"(e1,e2).
I'm looking for somthing like e3 <- e1 ++ e2
The R parser limits the operators it recognizes to the predefined ones,
plus user-defined ones of the form %op% (where op could be ++ if you
liked). You can't define ++ as an operator because the parser will see
it as two plus signs, not as a single infix operator.
Duncan Murdoch
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