[ncl-talk] markers with different colors

[Mary Haley]

[Please don't CC me on questions that are sent to ncl-talk.  I'm on
ncl-talk, so I will see your follow-up messages.]

You need to have a unique identifier for each time you call gsn_add_xxxxx.

The easiest way to do this, without having to predefine an array to hold
all the objects, is to use unique_string to generate a unique string name,
and then use this string name as an attribute name.

So, instead of:

     dum =gsn_add_polymarker(wks,plot,lon,lat,res_mark)

use:
  str = unique_string("poly")
  plot@$str$ = gsn_add_polymarker(wks,plot,lon,lat,res_mark)

--Mary




On Thu, Oct 22, 2015 at 12:37 PM, Geeta Geeta <geetag54 at yahoo.com> wrote:

> Hi all.
> I was trying to give a different color to the rainfall range (value)
> recently. My actual data is some 300+ stations an when I run that script,
> the plot was all crowded .
>
> I thought of giving a different color to the marker itself without adding
> the text/rainfall value to the plot.
> here is that part
> ;---------Adding Markers according to rainfall value
>
>   nrf                     = dimsizes(rf)
>   markers                 = new(dimsizes(rf),string)
>   dont_mark               = "red"
>
>   res_mark                = True
>   res_mark at gsMarkerIndex  = 1  ; 17 predefined markers available
>   res_mark at gsMarkerSizeF  = 0.012
> ;  res_mark at gsMarkerColor = "black"
>
>   do n                             = 0,  nrf-1
>      if (rf(n).eq.0.0) then
>       res_mark at gsMarkerColor       = "Black"
> ;     dum =gsn_add_polymarker(wks,plot,lon,lat,res_mark)
>
>         else if ((rf(n).ge.0.1).and.(rf(n).lt.2.4)) then
>         res_mark at gsMarkerColor       = "Blue"
>
>            else if ((rf(n).ge.2.5).and.(rf(n).lt.7.5)) then
>            res_mark at gsMarkerColor  = "Red"
>            end if
>         end if
>       end if
> ;  end do
>
>      dum =gsn_add_polymarker(wks,plot,lon,lat,res_mark)
>   end do
> print(rf+res_mark at gsMarkerColor)
>
> ; ----------Now adding text--------------------
> I get warning like this and the Plot  has Only Black markers????
> warning:TransformPostDraw: tfPolyDrawList element 273 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 274 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 275 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 276 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 277 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 278 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 279 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 280 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 281 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 282 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 283 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 284 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 285 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 286 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 287 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 288 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 289 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 290 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 291 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 292 is invalid
> warning:TransformPostDraw: tfPolyDrawList element 293 is invalid
> aditya at agniilap:~/geeta/ncl$
> kindly suggest.
>
>
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