
When I use the image() function for a relatively small matrix it works perfectly, eg.x <- 1:100
> z <- matrix(rnorm(10^4),10^2,10^2)
> image(x=x,y=x,z=z,col=rainbow(3))but when I want to plot a larger matrix, it doesn't really work. Most of the times, it just plot a few intermitent points.x <- 1:1000
z <- matrix(rnorm(10^6),10^3,10^3)
image(x=x,y=x,z=z,col=rainbow(3))

Generating the matrix didn't seem to be a problem. I would appreciate any thoughts and ideas.
I have tried using heatmap in bioconductor. However, I want to substitute the dendograms with axes, but when I suppressed the dendogram, I can't successfully add any axis. If anyone knows heatmap() well and would like to help via this function, it would work also.
Cheers!Karen Liu 		 	   		  
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