[ncl-talk] Fwd: Adding Up Files

[Maria Gehne - NOAA Affiliate]

Hi Tim,

what are the dimensions of REF in each file? Are you really trying to read
only the first level/time (or whatever the first two dimensions are)?

I would get rid of the loop entirely. Join the files instead of
concatenating, that gives you an extra dimension. And then you can just sum
over the first dimension. So:

ref = a[:]->REF(0,0,:,:)   ; now ref is 75 x nlat x nlon

ref_tot = dim_sum_n_Wrap(ref,0)   ; sums over the first dimension and keeps
meta-data

Hop this helps,

Maria


On Wed, Nov 25, 2015 at 3:51 AM, Tim Melino <melino33 at gmail.com> wrote:

> Hi,
>
> I am trying to add up reflectivity values from a bunch of netcdf radar
> data but I can't quite get it to work. I have 75 files to loop over and I
> am trying to add to the total each iteration. I have attached the code
> below. If anyone has any ideas how to put this together correctly that
> would be great!
>
>   ;========================
>   ; get list of all files and open as "one big file"
>   ;========================
>    fils = systemfunc ("ls ./grids/ncf*.nc") ; file paths
>    a    = addfiles (fils, "r")
>    ListSetType (a, "cat")        ; concatenate (=default)
>
>   type = "png"
>   wks = gsn_open_wks(type, "radar")
>
> ; Set some Basic Plot options
>   res = True
>   res at gsnDraw      =  False                   ; do not draw the plot
>   res at gsnFrame     =  False                   ; do not advance the frame
>   pltres = True
>   pltres at NoTitles = True
>   pltres at CommonTitle = True
>   pltres at PlotTitle = "Radar Reflectivity DbZ"
>   pltres at PanelPlot = True
>   pltres at FramePlot = False
>
> ; Set the Colormap
>   gsn_define_colormap(wks,"WhBlGrYeRe")
>     FillValue = 0
>     lat  = a[0]->lat0(:,:)
>     lon  = a[0]->lon0(:,:)
>
>    total = 75
>    i = 0
>    do while(i.le.total)
>       ;print (i)
>       if ( i .gt. 0 ) then
>       ref_save = a[i]->REF(0,0,:,:)
>       ref_save = where(ref_save.lt.45,FillValue,ref_save)
>       ref_tot = ref_tot + ref_save
>       ;print (ref_save)
>       else
>        ref_tot = a[i]->REF(0,0,:,:)
>        ref_tot = where(ref_tot.lt.45,FillValue,ref_tot)
>       end if
>
>    i=i+1
>    end do
>
>
>
>
> Thanks in advance!
> -Tim
>
>
>
>
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