can't undestand warning

Hi NCL-talk,

I'm working on my plot and I always get a warning in the terminal I
can't understand or figure out of which function is meant. Is anyone
able to help me?

Thank you,
Katja

My script is as follows:

;*************************************************
; traj_2.ncl
;*************************************************
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
;**************************************************
begin
;*************************************
; read in data
;************************************
   path = "/home/lohmueller/Desktop/BA/Amdardaten/Flutra01JanDLH_1.asc"
   data = asciiread(path,(/72,4/),"float")
  ; print(data)
   ntime=72

;********************************************
  wks = gsn_open_wks("pdf","trajectory") ; open workstation
;*********************************************
; color preps
;*****************************

  cnLevels=fspan(-65.0,0.0,14)

;colors =
(/"RoyalBlue","IndianRed","PaleGreen","MidnightBlue","DeepSkyBlue1","DarkTurquoise","DarkGreen","LimeGreen","yellow","OrangeRed","VioletRed","VioletRed3","MediumOrchid4","MediumPurple3"/)
  ; rgb = span_named_colors(colors,False)
   ;gsn_define_colormap(wks,rgb)

   ;color="/home/lohmueller/Desktop/BA/NCL/Tempe.rgb"
   ;gsn_define_colormap(wks,"BlWhRe")

     cmap = gsn_retrieve_colormap (wks)

     gsn_define_colormap (wks,"BlWhRe")

;cmap= RGBtoCmap("/home/lohmueller/Desktop/BA/NCL/Temp.rgb")
;gsn_define_colormap (wks,cmap)

    res = True ; map resources

    res@gsnDraw = False ; don't draw
    res@gsnFrame = False ; don't advance frame
    res@vpWidthF = 0.70 ; make map bigger
    res@vpHeightF = 0.70
    res@mpMaxLatF = 55 ; select subregion
    res@mpMinLatF = 20
    res@mpMaxLonF = 65
    res@mpMinLonF = 5

    res@gsnMaximize = True
    res@gsnPaperOrientation = "landscape"
    res@gsnSpreadColors = True ; use full
range of colors
    res@mpFillOn = True ; turn map fill on
    res@mpOutlineOn = True ; turn the map outline on
    color1 = NhlNewColor(wks,0.75,0.75,0.75) ; add a
lighter gray to the color map
    res@mpFillColors = (/ -1,-1,102,-1/) ; color of the
continents: gray

; label bar resources
    res_lb = True
    res_lb@vpWidthF = 0.60
    res_lb@vpHeightF = 0.10
    res_lb@lbPerimOn = False ; Turn off perimeter.
    res_lb@lbOrientation = "Horizontal" ; Default is vertical.
    res_lb@lbLabelStride = 2 ; an welchen Strich was stehen soll
    res_lb@lbLabelAlignment = "InteriorEdges" ; Default is "BoxCenters".
    res_lb@lbMonoFillPattern = True ; Fill them all solid.
    res_lb@lbLabelFontHeightF = 0.015
    res_lb@lbFillColors = cmap(:,:) ; Colors for boxes.

    res@tiMainString = "Flug 601 01.Januar DLH" ; title
    res@gsnCenterString = "Tempereatur [°C]"

    map = gsn_csm_map_ce(wks,res) ; create map
   delete(res)
;*********************************************
;trajectory parameters
;*********************************************

xpt= new(ntime,float)
ypt= new(ntime,float)
t= new(ntime,float)

;*********************************************
;plot parameters
;*********************************************

pres = True
pres@gsLineThicknessF = 2.0

mres = True
first= True
last= True

;*********************************************

do i=0,ntime-1
   ypt(i) = data(i,0) ;extract latitude(Breite(N))
   xpt(i)= data(i,1) ;extract longitude(Länge(E))
   t(i) = data(i,3)
end do

print(t)

draw(map)

    do j= 0,ntime-2
      pres@gsLineColor=GetFillColor(cnLevels,cmap,t(j))
      ;pres@gsLineColor=GetFillColor(cnLevels,cmap,avg((/t(j),t(j+1)/)))
      gsn_polyline(wks,map,(/xpt(j),xpt(j+1)/),(/ypt(j),ypt(j+1)/),pres)
      ;gsn_polyline(wks,map,xpt(j),ypt(j),pres)
    end do

;; create a unique marker to indicate the start of the trajectory

       first@gsMarkerSizeF = 5.0 ; marker size
       first@gsMarkerColor = "red" ; marker color
       last@gsMarkerSizeF = 9.0 ; marker size
       last@gsMarkerColor = "blue" ; marker color

       gsn_polymarker(wks,map,xpt(0),ypt(0),first) ;draw start of trajectory
       gsn_polymarker(wks,map,xpt(71),ypt(71),last) ;draw end of trajectory
       ;delete(first@gsMarkerColor)
       ;delete(first@gsMarkerSizeF)

gsn_labelbar_ndc(wks,dimsizes(cnLevels)+1,cnLevels,0.20,0.20,res_lb)
frame(wks)

print(dimsizes(cnLevels))

end

warning:Argument 2 of the current function or procedure was coerced to
the appropriate type and thus will not change if the function or
procedure modifies its value

-- 
Katja Lohmüller
Institut fuer Meteorologie und Klimatologie
Leibniz Universitaet Hannover
Herrenhaeuser Str. 2
30419 Hannover
Email: lohmueller@muk.uni-hannover.de
Mobil: 0049 176 61396963
Buero: 0049 511 762 2396
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