Re: [ferret_users] Manipulating Data in netCDF files using conditionalstatements

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Waylon,
This is the concept of "masking" which is easy to do in Ferret.  Say your variable is my_var, in a file called my_data.nc

yes? USE my_data.nc
yes? LET mask = IF my_var GT 2000 THEN 0 ELSE 1
yes? LET new_var = mask * my_var

or, you can define the new variable in one step

yes? USE my_data.nc
yes? LET new_var = IF my_var GT 2000 ELSE 0 ELSE my_var

Waylon.Collins wrote:

Dear Ferret User List,

Does anyone have a ferret script that will alter data values of variables (already written to netCDF files) based on conditional statements? For example, I want to replace any value (of a particular variable) with the value of zero, if the value is greater than 2000.

Waylon

-- 
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Ansley Manke, NOAA/PMEL   ansley.b.manke@noaa.gov
7600 Sand Point Way NE, Seattle WA
Phone 206-526-6246,  FAX 206-526-6744