how to plot this contour map

Hi dear all,

I have some data to plot, but got no idea which function I should use. The
data is like V(100,100), but the value on most grids are zero, I want to
plot contours on those non-zero area, say, V(30:40, 30:40). So What command
should I use? Thank you!

-- 
Cordially,
Hongyan
鸿雁

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Received on Mon Oct 11 16:10:59 2010