R devel - Jan 2004 - (PR#6452) Re: predict.princomp fails if princomp was called

Yes, and it should fail or return NA, as the required information is not
available. The problem is that it had logical NAs not numeric NAs for the
center component.

#3682 points out something that is on the help page: if you supply covmat 
as a matrix (and not a covariance list) there is no information on the 
centring done and x is ignored.

On Thu, 22 Jan 2004 joehl@gmx.de wrote:
> 
> Dear all,
> 
> predict.princomp seems to expect non-NA component $center which is not set
> by princomp.default.
> 
> 
> Best regards
> 
> 
> 
> Jens Oehlschl?gel
> 
> 
> 
> > x <- matrix(rnorm(400), ncol=4)
> > predict(princomp(x, covmat=cov(x)), newdata=x[1:10, ])
> Error in if (center) { : missing value where TRUE/FALSE needed
> In addition: Warning message: 
> the condition has length > 1 and only the first element will be used in:
if
> (center) { 
> > version
>          _              
> platform i386-pc-mingw32
> arch     i386           
> os       mingw32        
> system   i386, mingw32  
> status                  
> major    1              
> minor    8.1            
> year     2003           
> month    11             
> day      21             
> language R
> 
> 
-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
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