[gradsusr] Sum daily values for precipitation

[Jennifer Adams]

If you want to show the gradual accumulation of precip at a single  
point over time, try this:
'set lat 'mylat
'set lon 'mylon
'set t 1 last'
'd tloop(sum(precip,t=1,t+0))'

--Jennifer



On Jun 27, 2011, at 10:12 AM, Rafanoharana Serge Claudio wrote:

>
>
> On Wed, Jun 22, 2011 at 9:45 AM, gabriel gavinho <gavinho.gabriel at gmail.com 
> > wrote:
> Dear Serge,
>
> The solution you proposed did solve the problem envolving the plot  
> of both variables, but it displays a straight line with the final  
> result for accumulated precipitation instead of the increasing line  
> presenting the gradual accumulation. Do you know how can I sort this  
> out?
> still, thank you very much for your help,
>
> regards
>
> Gabriel Gavinho
> Federal University of Rio de Janeiro
>
> 2011/6/21 Rafanoharana Serge Claudio <rafanoharana at gmail.com>
> Dear Gabriel,
>
> In order to obtain the total precipitation within a month, you can  
> just 'define acc=sum(pcp, t=1, t=31)'.
> If I really understand what you want is that you would like to  
> display both daily and accumulation within one graphic. If so, it's  
> a little bit tricky but what I can suggest is that if you want to  
> display both within one graphic, try to set gxout linefill since  
> linefill can deal with 2 variables, then go back to set gxout line  
> so it will be something like:
>
> 'sdfopen file.nc'
> 'set lat -23'
> 'set lon -45'
> 'set t 1 31'
>
> 'define acc=sum(pcp, t=1, t=31)'
> 'set gxout linefill'
> 'set lfcols 0 0'    (----> this is black color and you can refer to http://www.iges.org/grads/gadoc/colorcontrol.html)
> 'd pcp;acc'         (up til here, you have only the x and y value,  
> without the graphs, so you need to plot the graph)
> 'set gxout line'
> 'set ccolor 3'
> 'd pcp'
> 'set ccolor 5'
> 'd acc'
>
> Hope this can help,
>
>
> Regards,
>
> Serge
>
> 2011/6/21 gabriel gavinho <gavinho.gabriel at gmail.com>
> Dear Serge,
>
> I belive I did not make myself clear about the graphic I need.
> suppose I select a single point, let's say lat -23 lon -45, and set  
> the time to a month period, I will have the values of precipitation  
> for each day as it is in any meteogram.
> My problem is that I need to continually sum the daily valeus so I  
> can achive the total precipitation within a month but in a way I can  
> present an increasing line in over the daily values.
> I hope I could make it clear and I really appreciate your help
>
> Regars,
> Gabriel Gavinho
> Federal University of Rio de Janeiro.
>
>
> 2011/6/21 Rafanoharana Serge Claudio <rafanoharana at gmail.com>
> Dear Gabriel,
>
> What do you mean by "in the same graphic"? because I think it will  
> depends on that. For your precipitation data, if you set your gxout  
> to shaded, I think you won't see both values, but if you set your  
> gxout, for example to contour, you'll be able to see both.
>
> Let's say your precipitaion variable is "pcp". It will be something  
> like:
> 'sdfopen file.nc'
> 'set gxout contour'
> 'define acc=sum(pcp, t=1, t=31)'
> 'd pcp'
> 'd acc'
>
> So if you need for the day 17, just set t to 17 by adding 'set t 17'  
> right after 'sdfopen...'
> In addition, you can write your accumulation variable to your file  
> using 'set sdfwrite file.nc' followed by 'sdfwrite acc'.
> Maybe the following will give you more info.
>
> I quote from Bob Kuligowski:
>
> "GrADS can produce numerous types of file displays using gridded  
> data using set gxout:
>
> bar    (bar chart)
> line    (line graph)
> barb    (wind barbs)
> linefill (color fill between two lines)
> contour    (contour plot)
> scatter    (scatter plot)
> errbar    (error bars)
> shaded    (shaded contour plot)
> grfill    (shaded grid boxes)
> stream    (wind streamlines)
> fgrid    (grid boxes shaded for specified values)
> vector    (wind vector arrows)
> grid    (grid boxes with printed values)"
>
> Hope it can help,
>
> Regards,
>
> Serge
>
>
>
> 2011/6/21 gabriel gavinho <gavinho.gabriel at gmail.com>
> Dear Users
>
> I am having a hard time trying to sum the values for daily  
> precipitation during a month, in order put together both daily  
> values and the accumulative sum in the same graphic
>
> Can you help me?
>
> regards!
>
> Gabriel Gavinho
> Federal University of Rio de Janeiro
>
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>
>
>
> -- 
> Serge
>
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>
>
>
>
> -- 
> Serge
>
>
>
>
> -- 
> Serge
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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