Re: fatal:Div: operator failed, can't continue

From: wei huang <whua27_at_nyahnyahspammersnyahnyah>
Date: Mon Jan 31 2011 - 21:39:17 MST

Dear Respected Dr. Shea and Andrea,
Many thanks for your cooperation. The code is working fine, please would you
like to have a look on it. I want to confirm is it ok or not?
thanks again,
********************************

   qv = a->QVAPOR

    P = a->P ; perturbation

    Pb = a->PB ; base state pressure

    P = P + Pb ; total pressure

   theta = a->T ; perturbation potential temperature
(theta+t0)

   theta = theta + 300.

   TK = wrf_tk (P, theta)

   RH = wrf_rh (qv, P, TK)

   RH@_FillValue = -999

   RH = where(RH.ne.0,RH,RH@_FillValue)

   RH = 1. / RH

   print("min(RH)="+min(RH)+" max(RH)="+max(RH))

   printVarSummary(RH)

   qs = (qv/RH)*100

   copy_VarCoords(qv, qs )

   printMinMax( qs, True )

   printVarSummary(qs)

 end

;*********************************

(0) min(RH)=0.01 max(RH)=1.73741e+23

Variable: RH

Type: float

Total Size: 102667500 bytes

            25666875 values

Number of Dimensions: 4

Dimensions and sizes: [Time | 24] x [bottom_top | 39] x [south_north |
160] x [west_east | 105]

Coordinates:

Number Of Attributes: 3

  _FillValue : -999

  units : %

  description : Relative Humidity

(0)

(0) min=0 max=116.133

Variable: qs

Type: float

Total Size: 102667500 bytes

            25666875 values

Number of Dimensions: 4

Dimensions and sizes: [Time | 24] x [bottom_top | 39] x [south_north |
160] x [west_east | 105]

Coordinates:

Number Of Attributes: 1

  _FillValue : -999

On Tue, Feb 1, 2011 at 12:24 AM, Dennis Shea <shea@ucar.edu> wrote:

> I am sure that if you print the minimum value
> of RH you will see that it is zero.
>
> eg
>
> print("min(RH)="+min(RH)+" max(RH)="+max(RH))
> min(RH)=0 max(RH)=.....
>
> Hence,
>
> qs = (qv/RH)*100
>
> will fail.
>
> You can use the "where" function
>
> http://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml
>
> Please read the "Description" section. In particular, the
> "Caveat" section
>
> Good luck
>
>
> On 1/31/11 9:07 AM, wei huang wrote:
>
>> Thanks for your cooperation, kindly, I have changed the pressure hPa to
>> Pa but still it does not working and giving the same error: Any help
>> will be appreciated.
>> thanks
>>
>> P= a->P; perturbation; Pa
>>
>> Pb = a->PB; base state pressure; Pa
>>
>> P= P + Pb; total pressure
>>
>> T = a->T; perturbation potential temperature
>>
>> tk = T + 300.
>>
>> qv = a->QVAPOR; water vapor mixing ratio(kg/kg)
>>
>> RH = wrf_rh (qv, P, tk)
>>
>> printVarSummary(RH)
>>
>> qs = (qv/RH)*100
>>
>> printVarSummary(qs)
>>
>> Error:
>>
>> fatal:divide: Division by 0, Can't continue
>>
>> fatal:Div: operator failed, can't continue
>>
>> fatal:Execute: Error occurred at or near line 17 in file
>>
>>
>>
>> On Mon, Jan 31, 2011 at 11:36 PM, Dennis Shea <shea@ucar.edu
>> <mailto:shea@ucar.edu>> wrote:
>>
>> Please read the documentation:
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_rh.shtml
>>
>> ==
>> "qv" must be kg/kg , you are passing "g/kg"
>> "P" must be "Pa", you are passing "hPa"
>>
>>
>>
>> On 1/31/11 7:09 AM, wei huang wrote:
>>
>> Dear NCL users,
>>
>> I got an error to calculating saturated mixing ratio from the
>> wrf water
>> vapor mixing ratio. I donít know my assumption is correct or
>> not. Could
>> anyone help me to figure out the problem or any advice about it?
>>
>> Thanks
>>
>> wei
>> a = addfile("wrfout_02.nc <http://wrfout_02.nc/>
>> <http://wrfout_02.nc <http://wrfout_02.nc/>>","r")
>>
>>
>>
>> P= a->P; perturbation
>>
>> Pb = a->PB; base state pressure
>>
>> P= P + Pb; total pressure
>>
>> T = a->T; perturbation potential temperature
>>
>> tk = T + 300.
>>
>> qv = a->QVAPOR/1000; water vapor mixing ratio(g/kg)
>>
>> RH = wrf_rh (qv, P*.01, tk) ;P*0.01 converts Pa to hPa
>>
>> printVarSummary(RH)
>>
>> qvs = (qv/RH)*100; saturated water vapor mixing ratio(g/kg)
>>
>> printVarSummary(qvs)
>>
>> end
>>
>> ;*****************************************
>>
>> Variable: RH
>>
>> Type: float
>>
>> Total Size: 102667500 bytes
>>
>> 25666875 values
>>
>> Number of Dimensions: 4
>>
>> Dimensions and sizes:[24] x [39] x [south_north | 160] x
>> [west_east | 105]
>>
>> Coordinates:
>>
>> Number Of Attributes: 2
>>
>> units :%
>>
>> description : Relative Humidity
>>
>> fatal:divide: Division by 0, Can't continue
>>
>> fatal:Div: operator failed, can't continue
>>
>> fatal:Execute: Error occurred at or near line 16 in file
>>
>>
>>
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>>
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Received on Mon Jan 31 21:39:27 2011

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