Re: NGDOTS Warning

Hi,

I think there's still something strange going on here, so I'll go ahead and file a ticket on it (NCL-1574).

Dave, I have pared down the example and the data file.

--MARY

On Nov 9, 2012, at 3:48 AM, Jinqing LIU wrote:

> The problem is solved after adding
> 1) set vcMinMagnitudeF to a value > 0.5.
> Thanks very much !!
>
> -JinQ
>
> --
> JinQing LIU M.S.
> Room 418, College of Physical and Environmental
> Oceanography, Ocean University of China
> Song-Ling Road 238, Qingdao
> P. R. China, 266100
> --
>
>
> At 2012-11-09 07:46:58,"David Brown" <dbrown@ucar.edu> wrote:
> Hi JinQ,
> I apologize for not getting to this sooner, but it appears your data file is no longer on the ftp site. I am assuming it is called f2010.grib2. Can you put it there again? Without running your code
> I can tell you that I am pretty sure that the message comes from the vector code trying to draw a "calm circle" (wind speed < 0.5). It uses a low-level routine called NGDOTS to do this.
> The error is due to a limitation of this routine that does not allow it to be used with a log-scaled plot (either or both axes). I have not yet had a chance to look into whether this can be fixed. Possible workarounds are:
> 1) set vcMinMagnitudeF to a value > 0.5. This will prevent the calm circle from being drawn.
> 2) Assuming the Y Axis has a log scale, you could try setting the resource trYLog to False in order to make the Y Axis linear. Or set trYReverse to False in order to disable the "mirror-imaging". You could adjust for this by reversing the data itself using subscripting syntax v(::-1,:) would reverse the Y axis of the data.
> 3) Use another vector glyph style.
>
> -dave
>
>
> On Nov 7, 2012, at 3:58 AM, Jinqing LIU wrote:
>
>> hi,
>> I got the same error as
>> http://www.ncl.ucar.edu/Support/talk_archives/2011/0967.html
>> NGDOTS -- **Warning**
>> Log scaling or mirror-imaging have been requested via a SET call;
>> NGDOTS accepts only GKS world coordinates.
>>
>> In that message no solutions were provided. Can anyone give some suggestions?
>> The attachment is my scripts and the data is uploaded to the ftp.
>> Thanks in advance!
>>
>> -JinQ
>>
>>
>>
>>
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Received on Fri Nov 9 08:41:41 2012