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[ferret_users] if then masking inconsistency



Hi;
  IF THEN masking seems to be breaking down in certain small
regions of my field: my intermediate variable b7 doesn't retain
the B6 value everywhere B6 is defined:

yes? show var b7
 B7 = IF B6 THEN B6 ELSE ((BEDTC-1)/2)^NTC


yes? go digitize b6 nearest
             VARIABLE : DGTEXPR[X=357.8092 ,Y=51.61662 ]
             FILENAME : bedmBergscat255.nc
             LONGITUDE: 2.2W
             LATITUDE : 51.6N
          0.0000000
yes? go digitize b7 nearest
             VARIABLE : DGTEXPR[X=357.8092 ,Y=51.61662 ]
             FILENAME : bedmBergscat255.nc
             LONGITUDE: 2.2W
             LATITUDE : 51.6N
        ....

 	NOAA/PMEL TMAP
 	FERRET v6.1
 	Linux(g77) 2.6.9-22. - 03/26/08
 	 5-May-12 12:48

What gives?

cheers,

lev

Lev Tarasov -   Dept of Physics and Physical Oceanography,
		Memorial University of Newfoundland.
                email: lev@xxxxxx
                http://www.physics.mun.ca/~lev/
		Tel (709)-864-2675
		Fax (709)-864-8739


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