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modify strip labels with given text using lattice package

2 messages · Luigi Marongiu, David Winsemius

Luigi Marongiu
# 
Dear all,
I am drawing a barchart plot with lattice and the resulting strips are
taking the value of the variable being compared (in this example
"assay"). However I would like to write myself the value to place into
the strips, let's say I want to call the variables as "molecular test"
and "serological test" the values "a" and "b" respectively within
"assay". I have tried different approaches taken from the web but
nothing worked.
Would you have any tip?
Best regards
Luigi
test <- rep(c("Adenovirus", "Rotavirus", "Norovirus", "Rotarix",
"Sapovirus"), 2)
res <- c(0, 1, 0, 1,0, 1,0, 1,0, 1, 0, 1, 0, 1,0, 1,0, 1,0, 1)
count <- rnorm(20)
assay <- c(rep("a", 10), rep("b", 10))

df <- data.frame(test, res, count, assay, stringsAsFactors = FALSE)

library(lattice)
barchart(
    test ~ count|assay,
    df,
    groups = res,
    stack = TRUE,
    main = "Comparison of test results",
    xlab = "Count",
    col = c("yellow", "blue"),
    par.settings = list(
        strip.background = list(col="light grey"),
        superpose.polygon=list(col= c("yellow", "blue"))
    ),
    scales = list(
        alternating = FALSE
    ),
    key = list(
        space="top",
        columns=2,
        text=list(c("Negative", "Positive"), col="black"),
        rectangles=list(col=c("yellow", "blue"))
    )
)
David Winsemius
#
On Aug 31, 2015, at 1:17 PM, Luigi Marongiu wrote:

            

      
      
      
    

        
Look at ?barchart in the section on arguments to strip and then at ?strip.default for how to use `strip.custom`. If you needed finer control there are functions that return the panel, but this request did not require using it:

barchart(
   test ~ count|assay,
   df,
   groups = res,
   stack = TRUE,
   main = "Comparison of test results",
   xlab = "Count",
   col = c("yellow", "blue"),
   par.settings = list(
       strip.background = list(col="light grey"),
       superpose.polygon=list(col= c("yellow", "blue"))
   ),
   strip = strip.custom( factor.levels=c("molecular test","serological test") ),

   scales = list(
       alternating = FALSE
   ),
   key = list(
       space="top",
       columns=2,
       text=list(c("Negative", "Positive"), col="black"),
       rectangles=list(col=c("yellow", "blue"))
   )
)

            

      
      
      
    

        

      
      
    

        
David Winsemius
Alameda, CA, USA