[R] Adding labels into lattice's barchart

[Luca Meyer]

*** APOLOGIZES FOR THOSE READING THE LIST THROUGH NABBLE THIS WAS ALREADY POSTED THERE BUT NOT FORWARDED TO THE LIST FOR SOME UNKNOWN REASON ***

I have a dataset that looks like: 

$ V1: factor with 4 levels 
$ V2: factor with 4 levels 
$ V3: factor with 2 levels 
$ V4: num (summing up to 100 within V3 levels) 
$ V5: num (nr of cases for each unique combination of V1*V2*V3 levels) 

Quite new to lattice - I've started reading Deepayan's book a few days ago - I have written the following: 

barchart(V2 ~ V4 | V1, 
         data=d1, 
         groups=V3, 
         stack=TRUE, 
         auto.key= list(space="top"), 
         layout = c(1,4), 
         xlab=" " 
         ) 

which works just fine as a stacked bar chart with bars adding up to 100%. Now what I would like to see is the number of cases showing next to the 4 x-axis's labels - i.e. V2_L1, ... V2_L4. 

In other words now I see something like: 

*** V1_L1 *** 
V2_L4 AAAVVVVVVV 
V2_L3 AAVVVVVVVV 
V2_L2 AAAAAVVVVV 
V2_L1 AAVVVVVVVV 
*** V1_L2 *** 
V2_L4 AAAAAAVVVV 
V2_L3 AVVVVVVVVV 
etc... 

But what I am looking for is something like: 
*** V1_L1 *** 
V2_L4 (n=60) AAAVVVVVVV 
V2_L3 (n=10) AAVVVVVVVV 
V2_L2 (n=52) AAAAAVVVVV 
V2_L1 (n=15) AAVVVVVVVV 
*** V1_L2 *** 
V2_L4 (n=18) AAAAAAVVVV 
V2_L3 (n=74) AVVVVVVVVV 
etc... 

How can I do that? I have tried: 

V6 <- paste(V2," (n",V5,")") 

but what i get when I run 

barchart(V6 ~ V4 | V1, 
         data=d1, 
         groups=V3, 
         stack=TRUE, 
         auto.key= list(space="top"), 
         layout = c(1,4), 
         xlab=" " 
         ) 

is a bunch of empty bars due to the fact that the unique combinations have risen. 

Any help would be appreciated. 

Thanks, 
Luca 

Mr. Luca Meyer 
www.lucameyer.com