[R] Scoping issue with irf() from {vars}

[Tobias Muhlhofer]

Dear all:

There seems to be a problem with scoping, for irf() in vars, when
called within a function. Try the following:

-----------------------

testfun <- function(lags){
data(Canada)
var.2c <- VAR(Canada, p = lags, type = "const")
print(var.2c)
}

testfun(lags=3)

## Everything OK. Now this:

testfun2 <- function(lags){
data(Canada)
var.2c <- VAR(Canada, p = lags, type = "const")
itest <- irf(var.2c)
plot(itest)
}

testfun2(lags=3)

## I get an error message: Error in VAR(y = ysampled, p = lags, type =
"const") (from #5) :
##  object 'lags' not found.

-------------------------

If you first assign lags and then define testfun2, it works. Seems to
me like a scoping problem. Any ideas?

Thanks!
   Toby

--
           Dr. Tobias Mühlhofer
           Assistant Professor
           Department of Finance
           Kelley School of Business
           Indiana University
           +1-812-855-9270
           http://tobias.muhlhofer.com