[R] Strange error returned or bug in gam in mgcv????

[David Winsemius]

On Sep 1, 2009, at 9:51 AM, Corrado wrote:

> Dear friends,
>
> what is this error message in gam???? I cannot understand what it  
> means ....
> is it a bug?
>
> gam_bray_scot24_pc_0505<gam(bray~s(PC1,PC2,PC3,PC4,PC5,
> PC1.1,PC2.1,PC3.1,PC4.1,PC5.1),data=dist_scot24_vector_with_climate)

If the code was as posted, you have entered "<" where you probably  
wanted "<-".
>
> Error in if (length(data) != vl) { :
>  missing value where TRUE/FALSE needed
> Calls: gam ... smooth.construct -> smooth.construct.tp.smooth.spec - 
> > array
> In addition: Warning message:
> In array(0, n * k) : NAs introduced by coercion
> Execution halted
>
> Thanks in advance,
>
> Best regards
> -- 
> Corrado Topi
>
> Global Climate Change & Biodiversity Indicators
> Area 18,Department of Biology
> University of York, York, YO10 5YW, UK
> Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT