[ncl-talk] Wondering Why I Get This Error

[Guido Cioni]

You can't convert fractional digit numbers to byte (see here https://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclDataTypes.shtml <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 <mailto: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 <mailto: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 <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 <tel:(914)%20432-3108>
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> 
> 
> Guido Cioni
> http://guidocioni.altervista <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 <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


Guido Cioni
http://guidocioni.altervista <http://guidocioni.altervista/>.org

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