[R] scatterplot error message

[David Winsemius]

On Oct 3, 2010, at 1:58 PM, nisaf wrote:

> Hi All. I am a new R user.  Trying to do scatterplot.  Not sure how to
> resolve this error message
>
> A<-subset (ErablesGatineau, station=="A")
>> B<-subset (ErablesGatineau, station=="B")
>> plot(diam ~ biom)

Did you also attache either (or both??? of those data.frames)?

>
>> abline(lm(diam ~ biom), col = "red")
>> goodcases <- !(is.na(diam) | is.na(biom))
>> lines(lowess(diam[goodcases] ~ biom[goodcases]))
>> library(car)
>> scatterplot(diam ~ biom, reg.line = lm, smooth = TRUE,
>
> +   labels = FALSE, boxplots = FALSE, span = 0.5, data = A)
>
> Error in `row.names<-.data.frame`(`*tmp*`, value = FALSE) :
>
>  invalid 'row.names' length

Given the fact that you deemed it necessary to "pre-qualify" your data  
when you constructed "goodcases", the invalid row.names length error  
suggest you may need to supply scatterplot() when using the reg.line  
argument with data that has been similarly culled of NA values.

?complete. case
?na.omit

Perhaps trying with a data=A[goodcases, ]

-- 
David.


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David Winsemius, MD
West Hartford, CT