[ncl-talk] Overlay of XY plot is not occurring

[Karin Meier-Fleischer]

Hi Atul,

your value range is wrong. You can use the printMinMax function to see 
the data range of the variables.

   printMinMax(tmean,0)
   printMinMax(tmin,0)
   printMinMax(tmax,0)

Returns

  : min=23.9729   max=25.8099
  : min=18.8202   max=20.6115
  : min=28.7211   max=31.7591

Add to the resources

   res at trYMinF = 18.
   res at trYMaxF = 32.

And you define plot2 with variable tmax instead of tmin.

  plot2 = gsn_csm_xy(wks,time,tmin,res)

-Karin

Am 13.11.19 um 13:44 schrieb Atul Saini via ncl-talk:
> Hello All,
> *Please have a look at the data and below given script, it is not 
> resulting into overlay.*
>
>
> begin
>   a=addfile("HP_Temp.nc","r")
>   tmean=a->tmean(:,0,0)
>   tmin=a->tmin(:,0,0)
>   tmax=a->tmax(:,0,0)          ; read in right variable (y2)
>   tmean_time=a->time(0:66)                ; this is our x
>  ;---Convert to fractional years for easier plotting.
>   time=cd_calendar(tmean_time,4)        ; scale for convenience
> ;---Start the graphics
>  wks = gsn_open_wks("png","xy")              ; send graphics to PNG file
> ;---Plotting options for time series plot
>   res             = True
>   res at gsnMaximize = True
>   res at gsnDraw     = False      ; Will draw later, after overlaying
>   res at gsnFrame    = False      ; all plots
>   res at vpWidthF    = 0.8        ; Make plots wider
>   res at vpHeightF   = 0.4
> ;---Resources for legend
>   res at pmLegendDisplayMode    = "Always"              ; turn on legend
>   res at pmLegendWidthF         = 0.12                  ; Change width and
>   res at pmLegendHeightF        = 0.15                  ; height of legend.
>   res at pmLegendOrthogonalPosF = -0.08                 ; move up slightly
>   res at lgLabelFontHeightF     = .011                  ; change font height
>   res at lgPerimOn              = False                 ; no box around
>   res at lgItemOrder            = (/1,0/)               ; reverse legend
> ;---Titles
>   res at tiMainString           = "Temperature"
>   res at tiYAxisString          = "Temp in Deg Celsius"
> ;---Turn off some tickmarks
>   res at tmXTOn                 = False    ; bottom off
>   res at tmYROn                 = False    ; right off
>   res at xyLineThicknessF       = 2.0      ; default is 1
>   res at xyMonoDashPattern      = True     ; force all solid lines
> ;--------------------------------------------------
> ; The time_axis_label function adds additional
> ; resources to "res" to produce nicely-formatted
> ; time labels on X axis. This function only works
> ; if you have a time "units" recognized by the
> ; cd_calendar function.
> ;---------------------------------------------------
> ;---Set resources for colors and labels
>   colors1 = (/"blue","red"/)
>   colors2 = (/"darkgreen","darkorange"/)
>   colors3 = (/"brown","purple"/)
>   labels1 = "Tmean"
>   labels2 = "Tmax"
>   labels3 = "Tmin"
> ;---Create the four XY plots
>   res at xyLineColors           = colors1
>   res at xyExplicitLegendLabels = labels1
>   res at pmLegendParallelPosF   = 0.15
>  plot1 = gsn_csm_xy(wks,time,tmean,res)
>   res at xyLineColors           = colors2
>   res at xyExplicitLegendLabels = labels2
>   res at pmLegendParallelPosF   = 0.37
>  plot2 = gsn_csm_xy(wks,time,tmax,res)
>   res at xyLineColors           = colors3
>   res at xyExplicitLegendLabels = labels3
>   res at pmLegendParallelPosF   = 0.59
>  plot3 = gsn_csm_xy(wks,time,tmax,res)
> ;---Overlay one plot on the other, so they become one plot.
>   overlay(plot1,plot2)
>   overlay(plot1,plot3)
>   draw(plot1)            ; This will draw all four plots
>   frame(wks)
> end
>
>
>
> Regards,
>
>
>
>
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