[R] XYplot in Lattice Package

[David Winsemius]

On Jan 15, 2009, at 9:27 PM, jimdare wrote:

>
> Dear R-Users
>
> I have 2 questions to do with XYplot.
>
> 1)
>
> I am trying to use the XYplot function to generate multiple line  
> graphs with
> the legend outside the plot.
> I am using the following loop for each graph:
>
> library(lattice)
>
> for (i in x.sp){
> xyplot(Catch~Year, df, groups = Stock, type="a",auto.key =
>       list(space = "top", points = FALSE, lines = TRUE,columns = 4))
> }
  From the help on package lattice:
"Note
High level Lattice functions (like xyplot) are different from  
conventional R graphics functions because they don't actually draw  
anything. Instead, they return an object of class "trellis" which has  
to be then printed or plotted to create the actual plot. This is  
normally done automatically, but not when the high level functions are  
called inside another function (most often source) or other contexts  
where automatic printing is suppressed (e.g. for or while loops). In  
such situations, an explicit call to print or plot is required."



Or the FAQ:

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f



>
>
> When I run the script I don't get any output graphs, however if I  
> change
> 'XYplot' to 'plot', or generate the plots manually using XYplot, It  
> seems to
> work.  Is there a bug of some sort or is it me?

It's you.

>
>
> 2)
>
> How do I remove the "top" and "right" axis from a plot?  If I add  
> 'axis(side
> = c("bottom", "left")' to the xyplot call it comes up with the  
> message:
>
> Error in axis(side = c("bottom", "left")) :
>  plot.new has not been called yet

see at the top of the axis help page:

"axis {graphics}" so axis is not part of lattice

Had you continued reading the next sentence in the lattice intro help  
page, you would have seen:

"Lattice plots are highly customizable via user-modifiable settings.  
However, these are completely unrelated to base graphics settings; in  
particular, changing par() settings usually have no effect on lattice  
plots."


Try:
http://stat.ethz.ch/R-manual/R-patched/library/lattice/html/axis.default.html

And chapter 8 of:

http://lmdvr.r-forge.r-project.org/figures/figures.html

Best of luck and buy Sarkar's book.
David Winsemius



>
>
> Any help is much appreciated :)
>
>
> -- 
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>
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