R help - Apr 2002 - predict with arima0

Dear R People:

I'm trying to use the predict command on an arima0 object.

I do the following:

xm.arma <- arima0(xm2,order=c(1,0,1))
predict(xm.arma,n.ahead=2)

and I get the message:
Error in round(x, digits) : Non-numeric argument to mathematical function


Any ideas what the problem might be, please?

R version 1 4 1 on Windows.

Thanks in advance!

Sincerely,
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
1 Main Street 
Houston, TX 77002
mailto: hodgess at uhddx01.dt.uh.edu
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Dear R People:

I'm having some problems with the predict command after the arima0
fit.  Here is my output:
> xx <- arima0(xm1,order=c(1,1,1))
> xx
Call:
arima0(x = xm1, order = c(1, 1, 1))

Coefficients:
    ar1      ma1  
 0.5084  -0.6205  

Approx standard errors:
   ar1     ma1  
0.2100  0.1889  

sigma^2 estimated as 9.055:  log likelihood = -814.17,  aic =
1632.34
> predict(xx,n.ahead=3)
Error in round(x, digits) : Non-numeric argument to mathematical
function
> 
Is there anything obviously wrong, please?  I'd be glad to send over the 
data if it would help!

Sincerely,
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
1 Main Street 
Houston, TX 77002
mailto: hodgess at uhddx01.dt.uh.edu
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
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