[gradsusr] Need Help for specific command

[MD ABDUS SATTAR]

Dear Rashed
I wrote my script as:

"define prod=N3*N4"
"define alpha=0.4,if(prod>0)"
"define alpha=0, if (prod<0)"
"endif"
"define Nct=N3-alpha*N4"
"define Nwp=N4-alpha*N3"

However, it does not work and I do not know my mistake here. I am
using NOAA Extended Reconstructed Sea Surface Temperature (SST) V4 data (
http://www.esrl.noaa.gov/psd/data/gridded/data.noaa.ersst.v4.html).

Could please tell me where I did mistake?

I look forward to your message.

Cheers
Abdus Sattar


On Tue, Nov 3, 2015 at 12:27 PM, Rashed Mahmood <rashidcomsis at gmail.com>
wrote:

> It should be simple using if else statement.
> Untested:
>
> prod = N3*N4
>
> if ( prod > 0)
>    alpha = 0.4
>  else
>   alpha = 0
> endif
>
> Nct = N3-alpha*N4
> Nwp = N4-alpha*N3
>
> hope that helps
>
>
>
> On Mon, Nov 2, 2015 at 4:52 PM, MD ABDUS SATTAR <
> md-abdus.sattar at students.mq.edu.au> wrote:
>
>> Dear Team
>> I was trying to calculate year by year time series from monthly mean SST
>> data by using following formula:
>>
>> [image: Inline image 1]
>> Where, N3 and N4 denote Nino3 and Nino4 indices respectively. I would
>> like to calculate NCT and NWP for a specific year, for instance, 1997
>> (January to December). My question is how can I define "α
>>
>> value" in GrADS so that it can use the value of 2/5 or 0 automatically?
>> If anybody could help me, it would be great.
>>
>> I look forward to your message.
>>
>> Best regards
>> Abdus
>> --
>> Md. Abdus Sattar
>> PhD Student
>> Department of Environmental Sciences
>> Level 2, Australian Hearing Hub Building
>>
>> Faculty of Science and Engineering
>> Macquarie University
>> NSW 2109 Australia
>>
>>
>> Cell: +61404400401
>> Email: md-abdus.sattar at students.mq.edu.au
>>
>> *AND*
>>
>> Assistant Professor
>> Department of Disaster Risk Management (DRM)
>> Faculty of Disaster Management
>> Patuakhali Science and Technology University, Dumki, Patuakhali,
>> Bangladesh
>>
>> Cell: +8801716851612
>> Email: abdus.sattar at pstu.ac.bd
>>
>> _______________________________________________
>> gradsusr mailing list
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>>
>>
>
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>


-- 
Md. Abdus Sattar
PhD Student
Department of Environmental Sciences
Level 2, Australian Hearing Hub Building

Faculty of Science and Engineering
Macquarie University
NSW 2109 Australia


Cell: +61404400401
Email: md-abdus.sattar at students.mq.edu.au

*AND*

Assistant Professor
Department of Disaster Risk Management (DRM)
Faculty of Disaster Management
Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

Cell: +8801716851612
Email: abdus.sattar at pstu.ac.bd
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