Re: NGDOTS Warning

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 Thu Nov 8 16:47:05 2012