[R] decrease amount of ticks on y axis in lattice levelplot

From: Bram Kuijper <a.l.w.kuijper_at_rug.nl>
Date: Thu, 31 Jan 2008 18:52:53 +0100


Hi all,

How can I decrease the number of ticks on the y-axis in a lattice levelplot()? I have as many ticks displayed on the y-axis as I have columns of data (1000 columns), how can I decrease this amount of ticks, while still properly displaying all the data?

Note that I get my data from a matrix object, in which the z-values of the levelplot are the actual values in the matrix, whereas the row and column names are the x and y ticks (and thus character data). I guess that is character data is the root of the problem, but I don't know how to solve it.

I tried to change the amount of ticks using yscale.components, but this doesn't work:

yscale.components.myY <- function(...) {

	Y <- yscale.components.default(...)
	Y$left$ticks$at <- pretty(1,n=10)
	Y$left$labels$at <- pretty(1,n=10)

	return(Y)

}
print(levelplot(my_matrix),cuts=100,yscale.components=yscale.components.myY)

My full code can be found on pastebin:
http://pastebin.com/m16b267f9

thanks in advance for any help on this,

Bram Kuijper



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