[ncl-talk] Sub -Natgrid function help

[Dennis Shea]

>From the natgrid documentation:

*natgrid* accepts a set of randomly-positioned 2D point coordinates,
together with function values at those coordinates, and returns a set of
interpolated function values at coordinates on a user-specified rectangular
grid. No missing values are allowed in the input data arrays.

===

If  x/y/zmight  have _Fillvalue

    if (any(ismissing(z)) ) then   ; assumin x and y are present
        ii = ind(.not.ismissing(z))
        xx = x(ii)
        yy = y(ii)
        zz = y(ii)

    zgrid = *natgrid*(x(ii), y(ii), z(ii), xi, yi)

  else

     zgrid = *natgrid*(x, y, z, xi, yi)

  end if





On Mon, Jan 25, 2016 at 3:03 PM, Mary Haley <haley at ucar.edu> wrote:

> ​You will have to do some debugging to figure this out, because without
> the data files, we can't verify that you are passing valid arrays to
> natgird.
>
> Did you actually look at lat, lon, lonn, and latt before you called
> natgrid to make sure there are no missing values?
>
> Here's what I suggest, to help you debug this problem. I'm just doing this
> for the "lon" variable, but you should do it for all of them:
>
> ;---Add these lines before you call natgrid
> printVarSummary(lon)        ; print information about the variable
> printMinMax​(lon,0)          ; print the min / max of 'lon'
> print("# of 'lon' missing values = " + num(ismissing(lon)))  ; count
> number of missing values
>
> ​--Mary
> ​
>
> On Mon, Jan 25, 2016 at 12:31 PM, Adv <advita6 at gmail.com> wrote:
>
>> Hi,
>> strll  = asciiread("stationmac.txt", -1, "string") ;
>>   print(strll)   ; STATION","STATION_NAME", "LAT", "LON"
>>   print("=====")
>>
>> sloc = str_get_field(strll , 2, ",")
>>   lat  = tofloat( str_get_field(strll , 3, ",")  )
>>   lon  = tofloat( str_get_field(strll , 4, ",")  )
>>   print(sloc +" : "+lat+" "+lon)
>> mnlat=(min(lat))
>> mxlat=(max(lat))
>> mnlon=(min(lon))
>> mxlon=(max(lon))
>> printVarSummary(lon)
>> print(lon)
>> print(lat)
>> lon at _FillValue = -95.06125
>> lat at _FillValue = 46.80
>> print(lon)
>> print(lat)
>> print(mnlon)
>> print(mxlon)
>> print(mnlat)
>> print(mxlat)
>> mlon = 391
>> dlon = -90.35 / mlon
>> lonn  = fspan (-116, (mlon - 1) * dlon, mlon)
>> print(lonn)
>> mlat = 391
>> dlat = 49.0 / mlat
>> latt  = fspan (40.01, (mlat - 1) * dlat, mlat)
>> print(latt)
>> diri="dailysimms/prec-obs/"
>> z1 = asciiread(diri+"tmax_avg_Jan1965-2005",-1,"float")
>> ;print(z1)
>> ;printVarSummary(z1)
>> ;a = (/1,2,3,4,5,6,7,8/)
>> ;390 rows by 50 columns
>> ;390 rows by 41 columns
>> a0 = onedtond(z1,(/391,41/))
>> ;print(a0)
>> x=dim_avg_n(a0,1)
>> print(x)
>> diri1="dailysimms/prec-obs/"
>> z2 = asciiread(diri1+"tmin_avg_Jan1965-2005",-1,"float")
>> ;print(z2)
>> ;printVarSummary(z2)
>> ;a = (/1,2,3,4,5,6,7,8/)
>> ;390 rows by 50 columns
>> ;390 rows by 41 columns
>> a1 = onedtond(z2,(/391,41/))
>> ;print(a1)
>> y=dim_avg_n(a1,1)
>> print(y)
>> ;tenth of degree celcius
>> s=(x+y)/20
>> printVarSummary(s)
>> print(s)
>> ;return
>> fo = natgrid(lon,lat,s,lonn, latt)
>>
>> The Error I encounter is fatal:natgrid: x cannot contain any missing
>> values
>>
>> I replaced the missing value with digits. Then also why would I get this
>> error? Could someone help me to fix this bug.
>>
>> Thank you
>> Adv
>>
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>
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