Dear all,
I am using ggplot with geom_tile to print as an image a matrix  I have. My matrix is a squared one of 512*512 cells. 

The code that does that is written below


> print(v + geom_tile(aes(fill=dB))+ opts(axis.text.x=theme_text(size=20),axis.text.y=theme_text(size=20), axis.title.x=theme_text(size=25) , axis.title.y=theme_text(size=25), legend.title=theme_text(size=25,hjust=-0.4) , legend.text=theme_text(size=20)) + scale_x_continuous('km')  + scale_y_continuous('km')    ) 



as you can see from the picture below

http://imageshack.us/photo/my-images/171/backupf.jpg/

this squared matrix is printed a bit squeezed with the height being bigger than the width. Would be possible somehow to print that plot by keeping the square-look of the matrix in the plot? Of course the other elements like axis and legend will make the over all plot to not be square but I do not care as the blue and red region forms a square.

I would like to thank you in advance for your help
B.R
Alex

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