[R] image.plot for non-regular grid: round pixel

[Sebastian Schubert]

Hi,

I am very new to R so I hope this is not stupid. Here a small example:
(I use R version 2.13.1)
########################
library("fields")

## round pixel
x=matrix(1:100,ncol=10)
y=matrix(1:100,ncol=10)
for(i in 1:10){
  x[i,] <- 1:10 + i
  y[i,] <- 1:10 + i/20
}


#x=1:10
#y=1:10

z=matrix(1:100,ncol=10)

pdf("test.pdf")

image.plot(x,y,z)

dev.off()
########################

With that, the generated pixels have round corners. Uncommenting the 
second assignements for x and y results in rectangular pixel.

For the actual data which I wanted to plot the round corners look much 
worse. What can I do to get non-round pixels?

Thanks a lot!

Sebastian
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