Re: [ferret_users] Gradient

[Paulo Santiago <paulohsm@xxxxxxxxx>]

Dear Theomar,

You may try @DDC (centered derivative) transformation:

http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#_VPINDEXENTRY_482

If you want the vertical gradient of a variable, do:

wind_gradient = wind[z=@ddc]

Cheers,

2015-04-15 12:23 GMT-03:00 Theomar Trindade <theomar_trindade@xxxxxxxxxxx>:

Hi,

I need to calculate a gradient of a variable, but I have no idea how to do that.

e.g.: wind_gradient=(wind(time,height+1)-wind(time,height))

Thanks,

--

Theomar Trindade de A. T. Neves
Meteorology Doc Student       | INPE/CPTEC

Doutorando em meteorologia |

Phone: 55(12)32086830

email: theomar_trindade@xxxxxxxxxxx
          theomar.neves@xxxxxxxxxxxxx
 

--

Paulo Santiago

Doutorado em Meteorologia

Programa de Pós-Graduação em Meteorologia

Instituto Nacional de Pesquisas Espaciais

Tel.: (12) 3186 8637