R help - Feb 2004 - Bug report for fracdiff

I was sniffing in the fracdiff library (this is for fractionally integrated
ARMA processes; Haslett and Raftery 1989).

The documentation suggests that one tries the following simple example:

library(fracdiff)
ts.test <- fracdiff.sim( 5000, ar = .2, ma = -.4, d = .3)
fracdiff( ts.test$series, nar = length(ts.test$ar), nma = length(ts.test$ma))

When I run this, I get the following error:

R --vanilla < demo.R > demo.out
Warning message: 
unable to compute correlation matrix in: switch(temp$info, warning("warning
in gamma function"), warning("singular Hessian"),


This doesn't look nice. Should I be worried? Is this a bug report? Does
R have a system like Debian's `reportbug' for submitting bugs.

Ajay Shah wrote:
> I was sniffing in the fracdiff library (this is for fractionally integrated
> ARMA processes; Haslett and Raftery 1989).
> 
> The documentation suggests that one tries the following simple example:
> 
> library(fracdiff)
> ts.test <- fracdiff.sim( 5000, ar = .2, ma = -.4, d = .3)
> fracdiff( ts.test$series, nar = length(ts.test$ar), nma =
length(ts.test$ma))

Works on Windows with R-1.8.1 with the recent version of fracdiff 1.1-1 
compiled with gcc-3.3.1. (you haven't told us any version information).

> When I run this, I get the following error:
> 
> R --vanilla < demo.R > demo.out
> Warning message: 
> unable to compute correlation matrix in: switch(temp$info,
warning("warning in gamma function"), warning("singular
Hessian"),
> 
> 
> This doesn't look nice. Should I be worried? Is this a bug report? Does
> R have a system like Debian's `reportbug' for submitting bugs.
Yes, see ?bug.report, but for contributed packages you should contact 
the package maintainer directly, library(help = fracdiff) tells you who 
it is ...

Uwe Ligges