Question

All the examples i find that use plot.im or similar, use matrices that are squared or almost squared. I am trying to plot pixel matrices with unusual sizes, for example 18×3000. My problem is that since the x/y ratio is so small, i only see a line in my plots. Is there any way to ‘scale’ the Y side of the image?

here is an example http://ubuntuone.com/0WchsKI5hd8YEqtTe7xAno

Thanks!

Answer 1

I am not too familiar with the im objects of spatstat, but guess from the reference manual that either of these should work (where x is your im object).

# Specify colors
jet.colors <- colorRampPalette(c("#00007F", "blue", "#007FFF", "cyan",
                      "#7FFF7F", "yellow", "#FF7F00", "red", "#7F0000"))(40)
# Using base R
# Note that you might need to transpose `x` to get the orientation right
image(t(as.matrix(x)), col=jet.colors)

# Using lattice
library(lattice)
levelplot(as.matrix(x), aspect="fill", cuts=39, col.regions=jet.colors)