R function Call from Another Function

Question

I need to modify the function gamGPDfit() in the package QRM to solve a problem. The function gamGPDfit() in turn calls other functions fit.GPD() and gamGPDfitUp() to compute the estimates of the parameters.

The structure of the function is shown below:

 #######################################################
 gamGPDfit<-function (..., init = fit.GPD(...) , ...)
 {
...
Par<-gamGPDfitUp(...)
...
return (list(...))
}
<environment: namespace:QRM>
#######################################################

Now, when I call fit.GPD(), I get the function on the command window to make the necessary modifications. However, the other function gamGPDfitUp() returns

 > gamGPDfitUp
 Error: object 'gamGPDfitUp' not found

The question is, how do I get such an in-built function within another function? Does it have to do with the environment QRM? If so how do I obtain the function to modify it?.

I have attached the function and the call of the gamGPDfitUp() is indicated in colour red.

LauriK · Accepted Answer · 2015-04-01 08:57:59Z

1

There's a couple of things that may come in handy.

One is help(":::") - Accessing exported and internal variables in a namespace. You can access GamGPDfitUp probably by prefixing it with QRM:::.

Another function is fixInNamespace, which allows you to modify functions inside packages. The help page for this one lists a few more interesting tools. Play around with this and it should solve most of your problems.

answered Apr 1, 2015 at 8:57

LauriK

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