[R] Adding text in the panels for Trellis plot ...

[Deepayan Sarkar]

On Thu, Nov 26, 2009 at 6:22 AM, ychu066 <ychu066 at aucklanduni.ac.nz> wrote:
>
> i was trying to do a for loop for plotting the histograms , but it doesnt
> work properly
>
>> library(lattice)
>> columns <- 8:153
>> plots <- vector("list", length(columns))
>> j <- 0
>> for (i in columns)
> + {
> +   plots[[ j <- j+1 ]] <- histogram( ~ data[,i] | data[,2],ylab =
> "Frequency",
> +   xlab = "Score", xlim = c(1,5), ylim = c(0,100),layout=c(3,1),
> +   main = c(colnames(data)[i],"index",j+1),mycolors =
> colors()[c(536,552,652,254,26)],
> +   panel = function(..., col, mycolors) {
> +   panel.histogram(..., col = mycolors[panel.number()])})
> + trellis.focus('strip', 1, 1, highlight=FALSE)
> + ltext(0.60, -0.25, 'PPM', col='blue', pos=3)
> + trellis.unfocus()
> + }
> Error in grid.Call.graphics("L_downviewport", name$name, strict) :
>  Viewport 'plot1.strip.1.1.vp' was not found
>>
>> print(plots[[1]])
>
>
> I am not sure what was happeneing. . . can anyone help me ?

Panel functions are for controlling the panel display. If you want to
control the strip, use the 'strip' argument to provide a custom strip
function.

-Deepayan