How can I draw polylines in panel plots ?

Hi,
   I met a strange problem which can not draw polylines on panel plots.
   I draw polylines in seperate plot and panel them with "gsn_panel", but what I get is just the last plot draw polyline in the panel.
   The scripts is as following:
;----------------------------------------------------
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
  fi = addfile("./slp.1963.nc","r") ;By the way, the dataset used here is
                                ;http://www.ncl.ucar.edu/Applications/Data/cdf/slp.1963.nc
  slp=fi->slp
  printVarSummary(slp)

  wks = gsn_open_wks("x11","t")
  plot=new(2,graphic)
  res = True
  res_at_gsnDraw = False
  res_at_gsnFrame = False
  do i=0,1
     plot(i) = gsn_csm_contour(wks,slp(0,:,:),res)
     ypts = (/ 0, 0 /)
     xpts = (/ 0, 60/)
     resp = True ; polyline mods desired
     resp_at_gsnDraw = False
     resp_at_gsnFrame = False
     resp_at_gsLineColor = "red" ; color of lines
     resp_at_gsLineThicknessF = 2.0 ; thickness of lines
     resp_at_gsLineLabelString= "test" ; adds a line label string
     dum=gsn_add_polyline(wks,plot(i),xpts(0:1),ypts(0:1),resp)
  end do
  resPa = False
  gsn_panel(wks,plot(0:1),(/2,1/),resPa)
end
;------------------

   Any advice is apreciated.
                                 
Best wishes,
Li
2008-10-21

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Received on Tue Oct 21 2008 - 03:25:46 MDT