skipping time

[Mike Bosilovich]

I came up with a way to do this. It is not elegant, but works, and I would
be happy to see another option. The idea is to maskout all other times
except the one you want to plot. However, grads won't let you take a single
time variable, and expand that into a time series so that it can mask the
other times. So, here goes, for 00Z:

set time 18Z1Jul2004 00Z2Jul2004
define m1=1
set time 00Z2Jul2004 06Z2Jul2004
define m2=1
set time 00Z2Jul2004 18Z2jul2004
define m3=m2*m1                         *m3=1 at 00Z2Jul, undef all others
modify m3 diurnal                          * now m3=1 for all 00Z

set time 00Z1Jul2004 18Z31jul2004
display var*m3

The display should have a time series of 00Z points. If you want those
points connected then prior to display, set missconn on.

Hope it helps,

Mike

On Thu, Jul 3, 2008 at 3:28 AM, Maat, Herbert ter <Herbert.termaat at wur.nl>
wrote:

>  Dear GrADS-users,
>
> I have a very simple question which is probably easy to answer as well.
>
> I have temperature data in a timeseries of, let's say, 120 timesteps (30
> days times 4 points per day; 00z 06z 12z and 18z). Using GrADS I want to
> display a selection of this data, namely only temperature at 00Z and
> skipping the other timesteps, thus display times 1, 4, 9, and so on. Is
> there a simple statement to do this in GrADS or do I need to end up writing
> a script for this?
>
> Kind regards,
> Herbert ter Maat
>
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