[ncl-talk] Creating a Scatter Plot With...

[Adam Phillips]

Hi Barry,
Thanks for providing a simple easy to use script that illustrates the
issue. Even though you are not creating a scatter plot, to get different
marker colors and styles you do need your x and y inputs to be two
dimensional as that is how the xyMarkerColors/xyMarkers resources apply
their settings.

As an example, if you have three markers to draw and you want each to be a
different color and a different symbol, the hypothetical coding would look
like this:
xaxis = new((/3,2/),float)    ; need two dimensional array for different
marker colors/styles, and the second dimension must be of size =>2
yaxis = xaxis

; fill in xaxis/yaxis arrays for (:,0), no need to fill in data for (:,1)
in this specific example

res = True
...
res at xyMarkerColors     =  (/"green","blue","red"/)
res at xyMarkers            = (/ 3,4,5/)
plot  = gsn_csm_xy (wks,xaxis,yaxis,res)

The above coding will result in:
xaxis(0,0) / yaxis(0,0) value being shaded green with marker style #3
xaxis(1,0) / yaxis(1,0) value being shaded blue with marker style #4
xaxis(2,0) / yaxis(2,0) value being shaded red with marker style #5

I've attached a modified version of your script with the resulting output.
Adam

On Thu, Sep 5, 2019 at 10:07 AM Barry Lynn via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Hello:
>
> I have a relatively simple program to create a scatter plot (attached).
>
> There are actually three sets of numbers, which are put into the xaxis and
> yaxis.
>
> I also set:
>
>   res at xyMarkerColors     =  colors
>
>   res at xyMarkers          :=  markers
>
>
> with the hope to create three sets of marker with different colors and
> marker symbol.
>
>
> However, all my markers are blue and the same symbol (the first setting).
>
>
> I am wondering how to set specific marker and colors for each element of
> the xaxis, yaxis, 1 dimensional arrays.
>
>
> I saw something in the NCL pages about creating a two dimensional array,
> but this was for a scatter plot, which mine technically is not.
>
>
> https://www.ncl.ucar.edu/Applications/Scripts/scatter_1.ncl
>
>
> Thank you,
>
>
> --
> Barry H. Lynn, Ph.D
> Senior Associate Scientist, Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
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>
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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