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

[ychu066]

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 ? 

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