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Setting Negatives to Zero


I have a very large data set (64000 x 583) in which negative values 
indicate "no data", unfortunately these negatives are not all the same. 
I would like to efficiently set all these negatives to zero. I know that 
I will likely be embarrassed when I see how to do it, but I can't seem 
to remember or figure it out. I should emphasize that because of the 
size of the data set, this needs to be done efficiently. Another 
programming language does it as follows:

		x(x < 0) = 0;

Thanks,

Kevin
-- 

Kevin J. McCann
Research Associate Professor
JCET/Physics
Physics Building
University of Maryland, Baltimore County
1000 Hilltop Circle
Baltimore, MD 21250


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