I am using caret's featurePlot
function to create a lattice plot. The X and Y axes show up in the diagonal boxes (see picture). I want to suppress these axes-- both the tickmarks and labels.

Thought I could set scales$draw to NULL, but that did not work. Here is what I tried:
trellisDefaultSettings = trellis.par.get()
trellis.par.set(theme=transparentTheme(trans = .4),
scales$draw=FALSE,
warn=FALSE)
featurePlot(x = features[, -1 * ncol(features)],
y = features$SpeciesName,
plot = "pairs",
auto.key = list(columns = 5))