[gradsusr] Display only a contour line equal to a threshold

[Lyndon Mark Olaguera]

Dear All,

I'm plotting the zonal wind (from a netcdf file) as contours and I would
like to display only the contour lines that are equal to "ZERO".

I tried this but it doesnt work:

'set z 3'
'set t 42'
if(uwnd=0)
'set gxout contour'
'd uwnd'
endif


I also tried using CDO but the output are all missing values.

cdo eqc,0 ifile.nc ofile.nc

Can anyone suggest how can I do this in grads?


Ill appreciate any help.

Sincerely,

*Lyndon Mark P. Olaguera*
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