Where's TDS? -- 'cause it's sure not in your data frame.

-- Bert

On Mon, Oct 24, 2011 at 2:17 PM, Rich Shepard <rshepard@appl-ecosys.com>wrote:

> On Mon, 24 Oct 2011, Rich Shepard wrote:
>
>   Perhaps because it's Monday I'm not successfully writing the xyplot()
>> command to show the quant, for example, for TDS by site. What I need to do
>> is plot the quant values for TDS vs. Cond, TDS vs. SO4, etc.
>>
>
>  I should have provided some of the attempts:
>
> xyplot(quant ~ TDS | site, data = burns.tds.anal)
> Error in eval(expr, envir, enclos) : object 'TDS' not found
>
> xyplot(quant ~ 'TDS' | site, data = burns.tds.anal)
> Warning messages:
> 1: In order(as.numeric(x)) : NAs introduced by coercion
> 2: In diff(as.numeric(x[ord])) : NAs introduced by coercion
> 3: In function (x, y, type = "p", groups = NULL, pch = if (is.null(groups))
> plot.symbol$pch else superpose.symbol$pch,  :
>  NAs introduced by coercion
>
> This produces a plot with no data in each panel.
>
> And I cannot see how to specify, for example, 'TDS' x 'Cond' because
>
> xyplot('TDS'$quant ~ 'Cond'$quant | site, data = burns.tds.anal)
> Error in "TDS"$quant : $ operator is invalid for atomic vectors
>
> and
>
> xyplot('TDS'[quant] ~ 'Cond'[quant] | site, data = burns.tds.anal)
> There were 25 warnings (use warnings() to see them)
>
> produces the panels without data in them.
>
> Rich
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
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