[ferret_users] inconsistent dynamic regridding

[Lev Tarasov <lev@xxxxxx>]

Hi all;
        I have an expression that gives dynamic
regridding errors even though the individual terms
in that expression  don't show that error :

yes? show var zh
 ZH = IF ZHB[G=H] GT (-1) THEN  ZHB[G=H] ELSE 0.
yes? stats zh
 **ERROR: unknown defining grid: G=H
yes? stats ZHB[G=H]

             ZHA[D=ALBadj40x40icethic.ascrev]
             regrid: ALATD[D=id92.nn9001]
             X (km): -2820 to 2820
             Y (km): -2820 to 2820
             Z:  N/A
             T:  N/A
             DATA SET: N/A

 Total # of data points: 19881 (141*141*1*1)
 # flagged as bad  data: 0
 Minimum value: -9999
 Maximum value: 4192.8
 Mean    value: -4908.6 (unweighted average)
 Standard deviation: 5913.4

    3> ./id92.nn9001.nc  (default)
 name     title                             I         J         K         L
 VERSHIS  history file version number      ...       ...       ...       1:21
 SEALEV   sea level                        ...       ...       ...       1:21
 ALATD    latitude, h-grid                 1:141     1:141     ...       ...
 ALOND    longitude, h-grid                1:141     1:141     ...       ...
 DAREA    cell area, h-grid                1:141     1:141     ...       ...
 H        ice thickness                    1:141     1:141     ...       1:21


 	NOAA/PMEL TMAP
 	FERRET v6.401
 	Linux(g77) 2.6.9-89.ELsmp - 12/09/09
 	20-Apr-12 13:52


How do I fix this?

Cheers,

Lev

Lev Tarasov -   Dept of Physics and Physical Oceanography,
		Memorial University of Newfoundland.
                http://www.physics.mun.ca/~lev/


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