[ncl-talk] Replacement of data with a constant value

[Dennis Shea]

*http://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml*
<http://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml>
*http://www.ncl.ucar.edu/Document/Functions/Built-in/num.shtml*
<http://www.ncl.ucar.edu/Document/Functions/Built-in/num.shtml>

I am not sure where you got the form you are using for '*where*'.
In no example is there an 'x=1' style for any of the arguments.

Also, given your description, I'm not sure that you want to use '*where'*

x       = *short2flt*( f->$vNam$   )            ; ( Orbits_grid1km,
YDim_grid1km, XDim_grid1km )
nx     = *num*(x.gt.-100 .and. x.lt.5000)   ; #  of values bwtweem -100 and
5000
===

x01   = *where*(x.gt.-100 .and. x.lt.5000, 0, 1)                  ; create
an array of 0 and 1
n1     = *num*(x.eq.1)                              ; also: *sum*(x)

On Mon, Jul 15, 2019 at 8:24 AM Herb, Jason via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Hello,
>
>
> I am working with the MCD19A2 data. In order to see the data extent for
> any given time period, 1 day, 1 month, 1 year, or any selected time period
> we need to assess.I have a binning code to add the points, however the
> points that are being added are the original AOD values in the hdf files.
> In order to do this I am attempting to replace all data points in the hdf
> file to " 1 " if there is data that is within the range flag of the data
> file. I have attempted to use the "where" function to make these
> replacements however I keep getting error bugs coming up. The portion of
> the script can be found below.
>
>
> Script error messages
>
> fatal:syntax error: line 120 in file MCD19A2.Jason1.ncl before or near =
>      x1 = where(x.gt.-100 .and. x.lt.5000, x =
> ---------------------------------------------^
>
> fatal:Syntax Error in block, block not executed
> fatal:error at line 136 in file MCD19A2.Jason1.ncl
>
> (0)
> =====> Wall Clock Elapsed Time: Main Sum Loop: nlat=3600, mlon=7200: 0
> seconds <=====
>
> fatal:Variable (f) is undefined
> fatal:["Execute.c":8640]:Execute: Error occurred at or near line 154 in
> file MCD19A2.Jason1.ncl
>
> fatal:Variable (f) is undefined
> fatal:["Execute.c":8640]:Execute: Error occurred at or near line 159 in
> file MCD19A2.Jason1.ncl
>
> warning:ContourPlotInitialize: no valid values in scalar field;
> ContourPlot not possible:[errno=1101]
> warning:ContourPlotInitialize: no valid values in scalar field;
> ContourPlot not possible:[errno=1101]
>
>
> Script coding
>  tStrt = systemfunc("date")         ; time the loop (wall clock)
>
>   do nf=0,nfil-1                     ; loop over all files
>      print(nf+"   "+fili(nf))
>      f       = addfile(diri+fili(nf)+".he2", "r")   ;  .he2 causes NCL to
> add lat/lon arrays
>                                      ; read data
>      lat2d   = f->GridLat_grid1km
>      lon2d   = f->GridLon_grid1km
>
>      x       = short2flt( f->$vNam$   )   ; ( Orbits_grid1km,
> YDim_grid1km, XDim_grid1km )
> ;*************** attmeping to change any AOD data other then N/A to 1 to
> count up
>      x1 = where(x.gt.-100 .and. x.lt.5000, x = 1)
>      delete(  x  )
>      x = x1
>
> Thank you for you time
>
> Jason
>
>
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