problem plotting "ts" in a data.frame

Hello:

       I'm having trouble plotting an object of class "ts" that is in a 
data.frame.  I can do it with(data.frame, plot(...)) but not with 
plot(..., data.frame);  see the example below.
The plot function is generic so the actual function call depends on what
arguments you give it: plot(y.ts) calls the plot.ts method from the
stats package, whereas plot(y.ts ~ x) calls the plot.formula method from
the graphics package. Only the plot.formula method has a data argument.

What happens when you call plot(y1~x1, data=XY) is that first
plot.formula is called and then this calls plot.ts with two arguments
(XY$x1 and XY$y1) that are expected to be compatible time series.
However, they are not. In fact x1 is numeric and when coerced to a time
series it has no time points in common with y1 (which starts at time
t=5). Hence the warning about non-intersecting series.

Since non-overlapping series seems to be fatal in this context it might
be a good idea to give an error at this point. Otherwise I think the
function is behaving correctly.

Martyn
       This work around gets me past this problem.  However, I thought 
the R Core team might want to know about this if they don't already.

       Thanks for all your work in making R and CRAN the great tools 
that they are -- and I apologize for wasting your time if you are 
already familiar with this.

       Spencer Graves

 > y.ts <- ts(2:4, 5)
 > XY <- data.frame(x1=6:8, y1=y.ts)
 > plot(y1~x1, XY)
Error in plot.window(...) : need finite 'xlim' values
In addition: Warning messages:
1: In .cbind.ts(list(...), .makeNamesTs(...), dframe = dframe, union = 
FALSE) :
   non-intersecting series
2: In min(x) : no non-missing arguments to min; returning Inf
3: In max(x) : no non-missing arguments to max; returning -Inf
4: In min(x) : no non-missing arguments to min; returning Inf
5: In max(x) : no non-missing arguments to max; returning -Inf
 > plot(y1, XY)
Error in plot(y1, XY) : object 'y1' not found
 > with(XY, plot(y1))
 > sessionInfo()
R version 3.2.3 (2015-12-10)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.2 (El Capitan)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods base

loaded via a namespace (and not attached):
[1] tools_3.2.3

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problem plotting "ts" in a data.frame

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