[R] Problems with lattice plot
Richard.Cotton at hsl.gov.uk
Richard.Cotton at hsl.gov.uk
Fri Jan 18 12:17:36 CET 2008
> I have some problems when I try to plot a lattice. The lattice has 200
> columns (X value) and 5 rows (Y value), with a total of 1000 squares. I
> want to plot this lattice with the squares having different colours
> according to a variable value.
>
>
>
> The variable I want to plot is cover value of a shrub, and it has values
> between 0 and 1. I want to plot the squares with value 1, black, the
> squares with values 0, white, and the values between 0 and 1 with grey,
> more or less dark depending on its proximity to 1 (dark grey) or 0
> (light grey). I have tried this:
>
>
>
> plot(x=transect41$x,y=transect41$y,asp=1,
>
> xlab="",ylab="",
>
> axes=F,pch=22,cex=1.01,lwd=0.05,
>
> bg=gray(1-transect41$CoverValue),col=gray(0.75))
>
> plot(pch=22,cex=1.01,lwd=0.05)
>
>
>
> When I plot the lattice, I have problems because the squares have
> different sizes. Moreover, some of them look like a rectangle and not a
> square.
>
> What can I do to solve this problem?
Be really careful with your terminology - to most R users, 'lattice plots'
refer to plots created using the lattice package. The function you want
is image, or its equivalent in the lattice package, levelplot.
Regards,
Richie.
Mathematical Sciences Unit
HSL
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