[gradsusr] Spatial trend using ltrend.gs

[Jayakrishnan P.R]

Thank you...Also there is another function in CDO for computing
trend....which is as follows...
cdo trend temp.nc trend1_temp.nc trend2_temp.nc

out of this trend2 is the slope which we want.

On Mon, Jun 11, 2018 at 6:40 PM, Andrew Friedman <andfried at gmail.com> wrote:

> Hi Jayakrishnan,
>
> I don’t think what you’re doing is wrong, but you also can just display
> the second output, slope (s in your case).
>
> USAGE: ltrend <input> [<output> [<slope> [<rmse>]]]
>   <input>: input field. Can be any GrADS expression.
>   <output>: output field, i.e., fitted trend line. Default=<input>.
>   <slope>: slope of fitted trend line, i.e., change of <input> per time
> step.
>   <rmse>: root mean square error.
>
> -Andrew
>
> > On Jun 11, 2018, at 5:56 AM, Jayakrishnan P.R <prjayakrishnan at gmail.com>
> wrote:
> >
> > Dear Users,
> >               I would like to calculate the spatial linear trend of
> temperature using long-term data and plot it using grads ltrend.gs. I
> would like to get a single plot which depicts the spatial trend at each
> grid point from t=1, t= last. I am doing like this. Kindly correct me if I
> am wrong.
> >
> > open temp.nc
> >
> > 'set t 1 last'
> > 'ltrend mx2t mx2tl s e'
> > 'set t 1'
> > 'define a=mx2tl'
> > 'set t last'
> > 'define b=mx2tl'
> > 'set gxout shaded'
> > 'd b-a'
> >
> > The obtained figure for the trend is attached herewith. Kindly help me
> to check I am right or wrong.
> > I am subtracting the last trend with the first trend to obtain a spatial
> map of the trend.
> > Thanks
> > Jayakrishnan
> >
> >
> > --
> > Sincerely
> >
> > **************************************************
> > Dr. Jayakrishnan P.R
> > Post Doctoral Research Fellow
> > Science Technology Building
> > School of System Science
> > Beijing Normal University
> > No. 96 XInjiekouwai Street
> > Beijing 100875
> > China
> > Tel: +86-188 11005715
> >
> > ****************************************************
> >
> >
> >
> >
> > <trend.png>_______________________________________________
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> > gradsusr at gradsusr.org
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>
>
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-- 
Sincerely

**************************************************
Dr. Jayakrishnan P.R
Post Doctoral Research Fellow
Science Technology Building
School of System Science
Beijing Normal University
No. 96 XInjiekouwai Street
Beijing 100875
China
Tel: +86-188 11005715

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