[R] Error in if (n > 0)

[David Winsemius]

On Aug 22, 2012, at 3:26 PM, Rich Shepard wrote:

>  I've searched the Web with Google and do not find what might cause  
> this
> particular error from an invocation of cenboxplot:
>
> cenboxplot(cu.t$quant, cu.t$ceneq1, cu.t$era, range=1.5, main='Total
> Recoverable Copper', ylab='Concentration (mg/L)', xlab='Time Period')
>
> Error in if (n > 0) (1L:n - a)/(n + 1 - 2 * a) else numeric() :
>  argument is of length zero
>
>  I do not an observation with a concentration of zero; the only  
> zeros are
> the lower limits for censored observations.

It is not saying there are zero values for concentration.... it is  
saying there are groups with zero elements:

 > table(cu.t$ceneq1, cu.t$era)

         Mining Pre-mining
   FALSE    723          0
   TRUE     183          9


>
>  The dput() output of the data frame 'cu.t' is attached.
>
-- 

David Winsemius, MD
Alameda, CA, USA