[R] heatmap aspect ratio

[Jacob Michaelson]

Hi all,

Does anyone know of a fairly easy way to "stretch" a heatmap  
vertically?  I've got 42 arrays and would like to be able to see as  
many significant genes as possible (right now I can only get 50 genes  
with it still being readable).  In some comparisons there are several  
hundred significant genes.

I've fiddled with the "asp" argument, but that doesn't give the  
results I'm looking for -- only scales the images, not the dendrograms.

Is there any way to make the heatmap rectangular rather than square  
without hacking the heatmap function itself (which is where I'm  
headed next)?

Thanks in advance,

Jake