[ncl-talk] Wondering Why I Get This Error

[Barry Lynn]

and here are the steps -- thanks again.

  Dbz = where(dbz.lt.0.0, dbz+256.0,dbz)

  dbz_f = tofloat(dbz)

  dbz_f = dbz_f*0.5 +0.33

  dbz = tobyte(dbz_f)

On Fri, Sep 8, 2017 at 11:53 AM, Barry Lynn <barry.h.lynn at gmail.com> wrote:

> Okay, will do.
>
> On Fri, Sep 8, 2017 at 11:53 AM, Guido Cioni <guidocioni at gmail.com> wrote:
>
>> You can't convert fractional digit numbers to byte (see here
>> https://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclDataTypes.shtml).
>> You would have to convert eveything to float (or double) and then compare
>> again.
>>
>> On 8. Sep 2017, at 10:51, Barry Lynn <barry.h.lynn at gmail.com> wrote:
>>
>> So, then I need to convert 0.5 and 0.33 to byte values, I assume --
>> regarding my last question.
>>
>> Thank you for clarifying.
>>
>> On Fri, Sep 8, 2017 at 11:48 AM, Guido Cioni <guidocioni at gmail.com>
>> wrote:
>>
>>> dbz is byte type -> wrap_around thus is byte type.
>>>
>>> 256. will be a floating point variable. In fortran, and thus NCL, if you
>>> write 256 you will get an integer variable, 256. (with the point) a float
>>> variable.
>>>
>>> Thus when making wrap_around=256. you are forcing an assignment between
>>> byte and float type, which NCL cannot do without spitting out a warning or
>>> and error. Imagine if this would happen without noticing...it could lead to
>>> all sort of weird errors.
>>>
>>> You have to convert wrap_around to float (for example with the function
>>> tofloat) before attempting that.
>>> Cheers
>>>
>>> On 8. Sep 2017, at 10:11, Barry Lynn <barry.h.lynn at gmail.com> wrote:
>>>
>>> Hi:
>>>
>>> I have some simple code, copied below.
>>>
>>> I cannot add the value of 256 to dbz or the value of wrap_around after
>>> setting it to 256.
>>>
>>>   wrap_around = dbz
>>>
>>>   wrap_around = 256.
>>>
>>>
>>>   do j = 0,dims2d(0)-1
>>>
>>>   do i = 0,dims2d(1)-1
>>>
>>>   check = ismissing(dbz(j,i))
>>>
>>>    if (check.eq.False)then
>>>
>>>    if (dbz(j,i).lt.0)then
>>>
>>>     dbz(j,i) = dbz(j,i) + wrap_around(j,i)
>>>
>>>    end if
>>>
>>>    end if
>>>
>>>   end do
>>>
>>>   end do
>>>
>>> fatal:["NclVar.c":1390]:Assignment type mismatch, right hand side can't
>>> be coerced to type of left hand side
>>>
>>> fatal:["Execute.c":8575]:Execute: Error occurred at or near line 35 in
>>> file ./ra
>>> PrintVarSummary gives:
>>>
>>> Variable: dbz
>>>
>>> Type: byte
>>>
>>> Total Size: 480960 bytes
>>>
>>>             480960 values
>>>
>>> Number of Dimensions: 2
>>>
>>> Dimensions and sizes: [radialR | 360] x [gateR | 1336]
>>>
>>> Coordinates:
>>>
>>> Number Of Attributes: 14
>>>
>>>   units : dBz
>>>
>>>   long_name : Reflectivity
>>>
>>>   missing_value : 0
>>>
>>>   signal_below_threshold : 0
>>>
>>>   scale_factor : 0.5
>>>
>>>   add_offset : -33
>>>
>>>   _Unsigned : true
>>>
>>>   range_folding_threshold : 50
>>>
>>>   _CoordinateAxes : timeR elevationR azimuthR distanceR
>>>
>>>   scale_factor_metadata : 0.5
>>>
>>>   add_offset_metadata : -33
>>>
>>>   range_folded_value_packed : 1
>>>
>>>   range_folded_value : -32.5
>>>
>>>   _FillValue : 0
>>> --
>>> Barry H. Lynn, Ph.D
>>> Senior Lecturer,
>>> The Institute of the Earth Science,
>>> The Hebrew University of Jerusalem,
>>> Givat Ram, Jerusalem 91904, Israel
>>> Tel: 972 547 231 170
>>> Fax: (972)-25662581
>>>
>>> C.E.O, Weather It Is, LTD
>>> Weather and Climate Focus
>>> http://weather-it-is.com
>>> Jerusalem, Israel
>>> Local: 02 930 9525
>>> Cell: 054 7 231 170
>>> Int-IS: x972 2 930 9525
>>> US 914 432 3108 <(914)%20432-3108>
>>> _______________________________________________
>>> ncl-talk mailing list
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>>>
>>>
>>>
>>> Guido Cioni
>>> http://guidocioni.altervista.org
>>>
>>>
>>
>>
>> --
>> Barry H. Lynn, Ph.D
>> Senior Lecturer,
>> The Institute of the Earth Science,
>> The Hebrew University of Jerusalem,
>> Givat Ram, Jerusalem 91904, Israel
>> Tel: 972 547 231 170
>> Fax: (972)-25662581
>>
>> C.E.O, Weather It Is, LTD
>> Weather and Climate Focus
>> http://weather-it-is.com
>> Jerusalem, Israel
>> Local: 02 930 9525
>> Cell: 054 7 231 170
>> Int-IS: x972 2 930 9525
>> US 914 432 3108 <(914)%20432-3108>
>>
>>
>>
>> Guido Cioni
>> http://guidocioni.altervista.org
>>
>>
>
>
> --
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
> US 914 432 3108 <(914)%20432-3108>
>



-- 
Barry H. Lynn, Ph.D
Senior Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108
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