Sounds like one of your data columns is constant.  The variance of a
constant is 0, and scaling would then divide by 0, which is impossible.

Kevin Wright


On Wed, Oct 31, 2012 at 7:47 AM, fillay89 <jasonfill@gmail.com> wrote:

> I am trying to run the R Script below, I have actually simplified it to
> just
> this part that is causing issues.  When I run this script I continue to get
> an error that says "cannot rescale a constant/zero column to a unit
> variance".  I cannot figure out what is going on here.  I have stripped
> down
> my data file so it is more manageable so I can try to figure this out.
>
> The data.txt file that is being read looks like this:
>
>
> I have made this file very basic on purpose to see if I could get this to
> work, but it is not working.  Of course once I get this to actually work I
> will expand the data file to match the data I am actually using.
>
>
>
> If I change the attribute in the prcomp function to scale=FALSE of course I
> can run my script.  But if it is scaling...which is causing the issues, it
> errors.
>
> Any help would be GREATLY appreciated.
>
>
>
> --
> View this message in context:
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> Sent from the R help mailing list archive at Nabble.com.
>
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>



-- 
Kevin Wright

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