[ncl-talk] question about gsn_csm_xy

[Manisha Ganeshan]

Thanks, Dave. I am using markers, and my xyMarkLineMode is set to indicate
that. I can now confirm that the density is the same but visually appears
different because the overlapping marker types vary when plotting 2D
arrays.
*"But there could easily be visible effects that are due to minor
differences between the two plot modes, such as the way that overlapping
markers are handled"*
Your above statement answered my question.

Thanks,
Nisha

On Thu, May 26, 2022 at 10:01 AM Dave Allured - NOAA Affiliate <
dave.allured at noaa.gov> wrote:

> Check your settings for xyMarkLineMode and/or xyMarkLineModes.  If either
> is set to "MarkLines", then you are drawing lines as well as markers.  This
> is one possible explanation for longer run time and apparent increased
> density.  In this case, I would suggest just use "Markers" for what I
> assume is a rather high density scatter plot.
>
>
> On Thu, May 26, 2022 at 6:59 AM Dave Allured - NOAA Affiliate <
> dave.allured at noaa.gov> wrote:
>
>> My interpretation of the function documentation is that a single "curve"
>> will be drawn for 1-D arrays,  and multiple "curves" will be drawn for 2-D
>> arrays.  So you are basically comparing two different kinds of plots.
>>
>> If you are plotting markers only, then I would expect the two plots to be
>> about the same.  But there could easily be visible effects that are due to
>> minor differences between the two plot modes, such as the way that
>> overlapping markers are handled.  I do not have a better explanation for
>> your density effect.
>>
>>
>> On Wed, May 25, 2022 at 9:49 AM Manisha Ganeshan via ncl-talk <
>> ncl-talk at mailman.ucar.edu> wrote:
>>
>>> Hello,
>>>
>>> I have two 2D arrays that I'm plotting as a scatter plot using
>>> gsn_csm_xy.
>>> If I convert them to 1D arrays using ndtooned, the plotting program runs
>>> a bit longer and the markers appear more densely packed. Other than that,
>>> the scatter plots appear the same.
>>> I'd like to know if I should expect any difference in the plots?
>>>
>>> Thanks,
>>> Nisha
>>>
>>> --
>>> Dr. Manisha Ganeshan
>>> Morgan State University
>>> Maryland, U.S.A.
>>>
>>

-- 
Dr. Manisha Ganeshan
Morgan State University
Maryland, U.S.A.
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