R Under development (unstable) (2023-11-25 r85635 ucrt) -- "Unsuffered Consequences"
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> library(RCytoGPS)
> 
> set.seed(53106)
> CL <- RCytoGPS:::cytobandLocations
> fake <- as.data.frame(matrix(runif(nrow(CL) * 10), ncol = 10))
> CL <- cbind(CL, fake) # extra colnames V1, ..., V10
> all(diff(as.numeric(CL$Chromosome)) >= 0) # check chromosome order
[1] TRUE
> 
> CD <- CytobandData(CL)
> barplot(CD, what = "V10")
> barplot(CD, what = list("V1")) # automagically converts list to vector
> 
> try( barplot(CD, what = c("V1", "V10")) )    # fail
Error in .local(height, ...) : 
  'what' must identify exactly one data column.
> try( barplot(CD, what = list("V1", "V10")) ) # fail
Error in .local(height, ...) : 
  'what' must identify exactly one data column.
> 
> # confirm usability within preset par grid
> opar <- par(mfrow = c(3,1))
> barplot(CD, "V2", "green")
> barplot(CD, "V3", "orange")
> barplot(CD, "V5", "purple")
> par(opar)
> 
> proc.time()
   user  system elapsed 
   0.21    0.03    0.25