Re: NGDOTS Warning

From: Jinqing LIU <liujq_0912_at_nyahnyahspammersnyahnyah> Date: Fri Nov 09 2012 - 03:48:56 MST · This archive was generated by hypermail 2.1.8 : Tue Nov 13 2012 - 14:27:24 MST

--
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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