# [ncl-talk] problem probability plotting

Rick Brownrigg brownrig at ucar.edu
Mon Apr 1 15:06:11 MDT 2019

```Hi,

I'm not sure what you find wrong with your plot -- I'm not an atmospheric
scientist, so I don't know by just looking.

However, you have these lines for plotting the markers:

llat = probt&lat
llon = probt&lon

I don't see where "probt" is defined anywhere, and I would expect that this
should give you an error. Did you mean simply "prob&lat", "prob%lon"?

Rick

On Tue, Mar 26, 2019 at 4:43 PM sunmin park <mireiyue at gmail.com> wrote:

> Dear NCL users
>
> I try to plot probability>0.95% on a map
> Used regcoef to get trend and betainc to get probability. Attached the
> figure from the following script.
>
> I do appreciate any help!
>
> Best,
> Sun-
> ************************************
>
> begin
>
> diri =
> "/Users/spark/03_Drought/Season_data/04_TOTALprecipitaton_season_mmperday_trend_21cen/"
> fili = "PRE_MAMmean4Dmmperday_21CEN.nc"
> filenc       = addfile (diri+fili+".nc", "r")
> varname = "pre"
> pme = filenc->\$varname\$
> time = filenc->time
>
> pmee = dim_avg_n_Wrap(pme,0)
>
> rc = regCoef(time,pmee(lat|:,lon|:,time|:))
> rc at long_name   = "regression coefficient"
> rc at units = "mm/day/century"
> copy_VarCoords(pmee(0,:,:),rc)
>
> rcc = rc*100
> copy_VarCoords(rc,rcc)
>
> tval = onedtond(rc at tval , dimsizes(rc))
> df   = onedtond(rc at nptxy-2, dimsizes(rc))
> df at _FillValue=-9999
> df   = where(df.le.0,df at _FillValue,df)
>
> b=tval
> b=0.5
> prob = betainc(df/(df+tval^2),df/2.0,b)
> prob at long_name = "probability"
> copy_VarCoords(rcc,prob)
>
> do i=0, dimsizes(lat)-1
>   do j =0, dimsizes(lon)-1
>     if(prob(i,j) .ltt. 0.05) then
>       print("lat "+lat(i)+" lon "+lon(j))
>     end if
>   end do
> end do
>
>   wks = gsn_open_wks("eps","PRE_US_trend_MAM")
>   gsn_define_colormap(wks,"BlRe") ;WhiteYellowOrangeRed") ;WhiteBlue")
>    ; choose colormap
>
>   res                     = True               ; plot mods desired
>   res at gsnDraw             = False              ; don't draw yet
>   res at gsnFrame            = False              ; don't advance frame yet
>   res at gsnAddCyclic        = False
>
>   res at cnFillOn            = True               ; turn on color
>   res at gsnSpreadColors     = True               ; use full color map
>   res at cnLinesOn           = False              ; no contour lines
>   res at cnLineLabelsOn      = False              ; no line labels
>
>   res at mpMaxLatF                   = 60     ; choose subregion
>   res at mpMinLatF                   = 20
>   res at mpMaxLonF                   = -75
>   res at mpMinLonF                   = -150
>
>   res at cnLevelSelectionMode = "ManualLevels"
>   res at cnMinLevelValF       = -0.004                 ; min level
>   res at cnMaxLevelValF       = 0.004     ; max level
>   res at cnLevelSpacingF      = 0.0001      ; interval
>   res at tmXBLabelFontHeightF     = 0.014         ; adjust some font heights
>   res at tmYLLabelFontHeightF     = 0.014
>   res at tiMainFontHeightF        = 0.022
>   res at txFontHeightF            = 0.017
>
>   res at lbLabelBarOn             = False
>   res at mpOutlineBoundarySets = "GeophysicalAndUSStates"
>   res at mpGeophysicalLineThicknessF = 1.0
>   plot1 = gsn_csm_contour_map_ce(wks,rcc,res)
>
>   res3 = True
>   res3 at cnInfoLabelOn       = False
>   res3 at cnLinesOn           = False
>   res3 at cnLineLabelsOn      = False
>   res3 at cnFillDotSizeF       = 0.004
>   res3 at cnLevelSelectionMode = "ManualLevels"
>   res3 at cnMinLevelValF       = 0.00
>   res3 at cnMaxLevelValF       = 1.05
>   res3 at cnLevelSpacingF      = 0.05
>   llat = probt&lat
>   llon = probt&lon
>
>   ppres                  = True
>   ppres at gsnPanelLabelBar = True                   ; common label bar
>   gsn_panel(wks,plot1,(/1,1/),ppres)
>
>   delete(wks)
> end
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