[ncl-talk] Variable size

[Dennis Shea]

UGRD_P0_L103_GLC0 (* lv_HTGL3*, ygrid_0, xgrid_0 )
level_type :   Specified height level above ground (m)
--------------------------------------------------------------------------

Likely, * lv_HTGL3, *is a coordinate variable.

print( UGRD_P0_L103_GLC0*&lv_HTGL3 *)

will tell you the levels (m)

So ...

    u2d = UGRD_P0_L103_GLC0 (0,:,: )

will yield a 2-dimensional variable corresponding to the 0-th dimension.

Let's say that * lv_HTGL3 *contained (/0, 2, 10/)

You could also use NCL's coordinate subscripting via the *{...}* syntax

u2d_0   = UGRD_P0_L103_GLC0 (*{0}*,:,: )
u2d_2   = UGRD_P0_L103_GLC0 (*{2}*,:,: )
u2d_10  = UGRD_P0_L103_GLC0 (*1**0}*,:,: )


On Thu, Nov 25, 2021 at 2:26 AM R. Lucas via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear NCL users
> i have 2 problems :
>
> 1) Is this varibable level looks like 10m above ground ?
> 2) This variable is 3d. How can I remove first dimension, somthing like
> (0,:,:)
> because I have a fatal error :
> fatal:["Execute.c":7925]:Number of subscripts on right-hand-side do not
> match
> number of dimensions of variable: (3), Subscripts used: (1)
>
> Thanks in advance.
> Rouss.
>
>
> float UGRD_P0_L103_GLC0 ( lv_HTGL3, ygrid_0, xgrid_0 )
>          center :       US National Weather Service - NCEP (WMC)
>          production_status :    Operational products
>          long_name :    U-component of wind
>          units :        m s-1
>          _FillValue :   1e+20
>          coordinates :  gridlat_0 gridlon_0
>          grid_type :    Lambert Conformal can be secant or tangent,
> conical or bipolar
>          parameter_discipline_and_category :    Meteorological products,
> Momentum
>          parameter_template_discipline_category_number :        ( 0, 0, 2,
> 2 )
>          level_type :   Specified height level above ground (m)
>          forecast_time :        0
>          forecast_time_units :  hours
>          initial_time : 11/23/2021 (06:00)
>
> grib2 (WRF ARW)
> NCL 6.6.2
> UBUNTU 20.04
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