[ncl-talk] gsn_csm_hov and gsnYRefLine

[Giorgio Graffino]

Oops, I didn't pay enough attention on that fundamental detail. Thanks Rick for pointing it out!
Yes, gsn_add_polyline() works, but I was wondering if a simple resource as gsnYRefLine could be set for doing that. Instead it's not possible to use that resource on graphic routines other than gsn_csm_xy(), isn't it? 

I think the reference to  "Windstress_timeseries_contour" is just due to the name of my script (Windtress_timeseries.ncl), nothing important.
Cheers,Giorgio
  ----Messaggio originale----
 
 Da: brownrig at ucar.edu
 
 Data: 30-mag-2019 5.06
 
 A: "Giorgio Graffino"<g.graffino at tim.it>
 
 Cc: "Ncl-talk"<ncl-talk at ucar.edu>
 
 Ogg: Re: [ncl-talk] gsn_csm_hov and gsnYRefLine
 

 

 
  
   Hi,
  
  
   

  
  
   This is a cursory response -- I really don't know the answer in any detail. But...
  
  
   

  
  
   - The docs on the resource gsnYRefLine state that it pertains to calls to gsn_csm_xy(), and so perhaps not surprising that errors stem from a call to  gsn_csm_hov():
  
  
   

  
  
       
   http://ncl.ucar.edu/Document/Graphics/Resources/gsn.shtml#gsnYRefLine
  
  
   

  
  
   - I am perplexed by the error message's reference to "Windstress_timeseries_contour". A reference to this symbol is not found anywhere in the NCL code base -- is this a function you might have written or otherwise drawn from a 3rd party library?
  
  
   

  
  
   - If I understand correctly your intent, your method of drawing multiple lines with gsn_add_polyline() would seem to be the better approach, as the docs for gsnYRefLine suggest only a singular line can be drawn.
  
  
   

  
  
   I hope that helps...
  
  
   Rick
  
  
   

  
  
   

  
 
 

 
  
   On Wed, May 29, 2019 at 7:22 AM Giorgio Graffino <
   g.graffino at tim.it> wrote:
   

  
  
   
    Dear NCL people,
   
   
    I am struggling on using the resource gsnYRefLine in Hovmoeller plots generated through gsn_csm_hov.
   
   
    

   
   
    Basically, I am trying to draw few reference lines (corresponding to major volcanic eruptions) in a series of time vs longitude plots, generated by using gsn_attach_plots. Every time I set the relevant resource, I obtain the following warning:
   
   
    

   
   
    warning:gsnYRefLine is not a valid resource in Windstress_timeseries_contour at this time
   
   
    

   
   
    I managed to obtain a decent result (see figure attached) by including a bunch of gsn_add_polyline commands in the code, but I'd like to know if there is a more elegant way to implement that, or either a way to use gsnYRefLine in a gsn_csm_hov plot. Any suggestions? Did I miss anything?
   
   
    

   
   
    Best regards,
   
   
    Giorgio
    

   
   
     
    

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