[ncl-talk] question about gsn_csm_xy

[Dave Allured - NOAA Affiliate]

Ah yes.  Different marker types on multiple "curves" in 2-D mode.  I had
not thought of that.  That is a satisfying explanation.  Thanks for letting
us know.


On Thu, May 26, 2022 at 10:40 AM Manisha Ganeshan <
manisha.ganeshan86 at gmail.com> wrote:

> 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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