Dan Riker riker at hydro1.geo.duke.edu
Thu Apr 8 23:52:07 EDT 1993

Hello all, just a quick question.
I need to make all the values in a raster map positive, so I used the 'if' statement that allowed me to multiply all values >0 by -1.  This works fine, but any subsequent calculations put me back in the negative values.
Any suggestions?
Dan Riker 
Duke University

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