R help - Oct 2008 - How to add a data line (series) to a plot using add=TRUE

Hello,

I'd like to use the add=TRUE parameter to add a second data line 
(series) to an existing plot, but R is giving me an error (see below).

This code:
 > rap<-plot(aspen_sort,ylim=c(1,10000),log="y")

...produces the plot to which I'd like to add the second line. But this 
code:
 > rap<-plot(pine_sort,add = TRUE)

...produces this error:

Warning messages:
1: In plot.window(...) : "add" is not a graphical parameter
2: In plot.xy(xy, type, ...) : "add" is not a graphical parameter
3: In axis(side = side, at = at, labels = labels, ...) :
  "add" is not a graphical parameter
4: In axis(side = side, at = at, labels = labels, ...) :
  "add" is not a graphical parameter
5: In box(...) : "add" is not a graphical parameter
6: In title(...) : "add" is not a graphical parameter

I have successfully used add=TRUE (in the same program!) with no errors, 
so I reckon the problem must be related to my data structures, but I 
can't see how.

Any ideas? Thanks!

Mark

add is not a graphical parameter

On Tue, Oct 28, 2008 at 3:49 PM, Mark Na <mtb954 at gmail.com>
wrote:
> Hello,
>
> I'd like to use the add=TRUE parameter to add a second data line
(series) to
> an existing plot, but R is giving me an error (see below).
>
try (untested):
plot(aspen_sort,ylim=c(1,10000),log="y")
lines(pine_sort)

>
> ...produces this error:
>
> Warning messages:
> 1: In plot.window(...) : "add" is not a graphical parameter
> 2: In plot.xy(xy, type, ...) : "add" is not a graphical parameter
> 3: In axis(side = side, at = at, labels = labels, ...) :
>  "add" is not a graphical parameter
> 4: In axis(side = side, at = at, labels = labels, ...) :
>  "add" is not a graphical parameter
> 5: In box(...) : "add" is not a graphical parameter
> 6: In title(...) : "add" is not a graphical parameter
>
> I have successfully used add=TRUE (in the same program!) with no errors, so
> I reckon the problem must be related to my data structures, but I can't
see
> how.
>
> Any ideas? Thanks!
>
> Mark
>
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>


-- 
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
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annoying little problems of being mammals.

								-K. Mullis