Re: [R] Howto reduce number of ticks in X, Y axis while still containing all the data

From: Dieter Menne <dieter.menne_at_menne-biomed.de>
Date: Fri, 20 Jun 2008 06:38:58 +0000 (UTC)

Gundala Viswanath <gundalav <at> gmail.com> writes:

> I am trying to plot 100 x 100 matrix data in a level plot.
> The problem I have is that the x/y -axis label in ticks
> are jumbled together. Thus I want X/Y axis to contain
> 10 ticks only, yet still plotting all the 100 data.
>
> Is there a way to do it?
> The code I have below doesn't work.
>

Well, the code did not work because you did not provide example data and forgot that levelplot is lattice, but when I add these two lines, it works for me. Scaling is 20,40,..., and all point are shown (hope so, I did not count).

Dieter

library(lattice)
mat.data = matrix(rnorm(100*100),nrow=100)

# Corr contains 100x100 matrix
corr <- cor(t(mat.data), method ="pearson")

# Plot them

levelplot(corr, main="PCC of Top-100 Genes",
                xlab="Gene",
                ylab="Gene",
                scale=list(y=list(tick.number=10)) # Doesn't work
                )

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