Change width of levelplot in R

Question

I have created a levelplot() in R using a data set with 5 rows and 50 columns.

rgb.palette <- colorRampPalette(c("green", "red"), space = "Lab")
levelplot(mat, col.regions=rgb.palette, xlab = "Risk Level", ylab = "Zones", main = "Risk  Profile")

The result looks like this:

Can someone please advice, how can I expand the plot horizontally and the labels of x-axis to be visible clearly?

Answer 1

Bu default, levelplot() use the isometric aspect so one unit in x equals one unit in y. You can change the default with

levelplot(mat, col.regions=rgb.palette, 
    xlab = "Risk Level", ylab = "Zones", main = "Risk Profile", 
    aspect="fill")

Answer 2

I would use transpose matrix

tmat <- t(mat)
levelplot(tmat, col.regions=rgb.palette, xlab = "Risk Level", ylab = "Zones", main = "Risk  Profile")