[gradsusr] summing

[Mike NOAA imap]

hi Sagar,

the reason why asum and asumg give the same answer is that world 
coordinates (e.g., lat/lon) bounds were on the grid boundary.  I wrote 
asumg to ignore if a the world coordinate bound was in the middle of a 
grid box.  If it was, then asum would only add half the value of that 
grid box to the sum whereas asumg would add the whole value.

best /r Mike

On 2012-10-16 19:35 , Sagar Parajuli wrote:
>
> Thank you, I just used asumg and it seems that both give the same result.
>
> Sincerely,
>
> Sagar Prasad Parajuli
>
> Graduate Student/Research Assistant
>
> University of Texas at Austin
>
> Jackson School of Geosciences
>
> 1 University Station C1100, JGB 5.322
> Austin, TX 78712
>
> Contact: psagar at utexas.edu <mailto:psagar at utexas.edu>
>
> Cell: 512 965 4093
>
> texas-longhorn-logo
>
> *From:*gradsusr-bounces at gradsusr.org 
> [mailto:gradsusr-bounces at gradsusr.org] *On Behalf Of *Jeff Duda
> *Sent:* Tuesday, October 16, 2012 2:27 PM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] summing
>
> Sagar,
> Note that asum uses weighting by latitude to account for projected 
> grids.  If you want to ignore that, use asumg.
>
> Jeff
>
> On Tue, Oct 16, 2012 at 2:25 PM, Sagar Parajuli <psagar at utexas.edu 
> <mailto:psagar at utexas.edu>> wrote:
>
> Thank you, I didn't realize the asum function.
>
> Sincerely,
>
> Sagar Prasad Parajuli
>
> Graduate Student/Research Assistant
>
> University of Texas at Austin
>
> Jackson School of Geosciences
>
> 1 University Station C1100, JGB 5.322
> Austin, TX 78712
>
> Contact: psagar at utexas.edu <mailto:psagar at utexas.edu>
>
> Cell: 512 965 4093
>
> *From:*gradsusr-bounces at gradsusr.org 
> <mailto:gradsusr-bounces at gradsusr.org> 
> [mailto:gradsusr-bounces at gradsusr.org 
> <mailto:gradsusr-bounces at gradsusr.org>] *On Behalf Of *Jeff Duda
> *Sent:* Tuesday, October 16, 2012 2:16 PM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] summing
>
> Sagar,
> Either nest the sum functions or use the asum function for areal sums.
>
> Jeff Duda
>
> On Tue, Oct 16, 2012 at 2:11 PM, Sagar Parajuli <psagar at utexas.edu 
> <mailto:psagar at utexas.edu>> wrote:
>
> Hi, can anyone suggest how to sum the values in a grid. I have to 
> first in t-direction and then in x and y direction.
>
> define a=sum(dstflxt*area, t=1, t=365)        (summing in t-direction, 
> this works fine)
>
> define b= sum(a,x=1,x=288,y=1,y=192)        (summing in x and y 
> direction, this doesn't work)
>
> d b
>
> It displays error in sum options.
>
> Please help.
>
> Sincerely,
>
> Sagar Prasad Parajuli
>
> Graduate Student/Research Assistant
>
> University of Texas at Austin
>
> Jackson School of Geosciences
>
> 1 University Station C1100, JGB 5.322
> Austin, TX 78712
>
> Contact: psagar at utexas.edu <mailto:psagar at utexas.edu>
>
> Cell: 512 965 4093
>
>
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>
>
>
>
> -- 
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
>
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>
>
>
>
> -- 
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
>
>
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