[ncl-talk] empty plots in panel-plot

[Mary Haley]

Dear Noelia,

When you are paneling a series of color contour plots and then paneling
them later, you first want to be sure you use a fixed set of contour levels
across all the plots, so you can then use a single labelbar in the final
panel plot.

The function nice_mnmxintvl
​ is what you can use to fix your contour levels

​
mnmxlvl = nice_mnmxintvl(min(data),max(data),16,False)

  res at cnLevelSelectionMode      = "ManualLevels"
  res at cnMinLevelValF            = mnmxlvl(0)
  res at cnMaxLevelValF            = mnmxlvl(1)
  res at cnLevelSpacingF           = mnmxlvl(2)

You will need to get the min and max of your data across all plots,
and pass that to​

The "min(data)" and "max(data)" are from another example. You will need to
plug in the min/max of your own data across all plots.

You now want to turn off the individual labelbar you're getting for each
plot:

  res at lbLabelBarOn    = False

and then turn on the panel labelbar when you call gsn_panel:

pres = True
pres at gsnPanelLabelBar = True
...
gsn_panel(...)

You may want to see our "panel" examples page:

http://www.ncl.ucar.edu/Applications/panel.shtml

I think panel_35.ncl uses the nice_mnmxintvl function.

--Mary

On Mon, Apr 10, 2017 at 11:37 AM, Noelia otero <noeli1680 at gmail.com> wrote:

> Hi!
>
> I am plotting in a panel plots seasonal means from different models, and I
> got some "empty" plots for some specific models and seasons. My guess is
> that it is due to the large spread of values (or some outliers). Maybe,
> it's a simple question..but I don't know how to set the resources to get a
> good label bar. I attach the final plot that I got with my code (see a part
> of the code below):
>
> ; i= model ,s =season
>
>      model = addfile(fils(i), "r")
>      c=str_split(fils(i), "/")
>      nmod=str_split(c(6), "#")
>      mmod=nmod(0)
>      print(nmod)
>      sfile=systemfunc("ls " + dir2 + mmod +"*"+ season(s)+".nc")
>      smodel=addfile(sfile, "r")
>
>       svar  = smodel ->$var$
>       svar!1="lat"
>       svar!2="lon"
>
> ;------Getting statistics for each grid point-------
>
>     stats_seas_var = new((/nlat,mlon/), typeof(svar),-9e+33)
>
> ;-------get 95th possition 25 of statistics---------
>
>
>     opt=False
>     do nl=0,nlat-1
>       do ml=0,mlon-1
>
>          seas_st_var = stat_dispersion( svar(:,nl,ml), opt)
>          stats_seas_var(nl,ml) = seas_st_var(0)
>
>          ;stat_dispersion: (0) mean, (1) std, (2), min, (14),max
>       end do
>    end do
>
>
>    stats_seas_var at long_name = "mean"
>    stats_seas_var!0="lat"
>    stats_seas_var!1="lon"
>    stats_seas_var&lat = lat
>    stats_seas_var&lon = lon
>
>     res = True
>     res at gsnMaximize = True
>     res at cnFillOn = True
>     res at cnLinesOn = False
>     res at gsnAddCyclic = False
>     res at gsnDraw = False
>     res at gsnFrame = False
>     res at mpMinLonF = min(lon)
>     res at mpMinLatF = min(lat)
>     res at mpMaxLonF = max(lon)
>     res at mpMaxLatF = max(lat)
>     res at lbLabelAutoStride=True
>     res at cnLevelSelectionMode = "ManualLevels"
>     res at cnMinLevelValF       = 0.
>     res at cnMaxLevelValF       = 10.
>     res at cnLevelSpacingF      =   5.
>     res at lbLabelBarOn = False
>     res at gsnCenterString =nmod(0)
>     res at gsnRightString =season(s)
>     plotseas = gsn_csm_contour_map(wks,stats_seas_var,res)
>
> I really appreciate any suggestion to improve it,
>
> Many thanks in advance,
>
> Noelia
>
>
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