[ncl-talk] Dimension error in Overlay plot

[S Br]

Hi All,
I am trying to prepare a line plot  (having two lines) using Overlay
function. Both individual lines are working fine, but I get the following
error message when I use the Overlay function.

fatal:Number of elements of dimension (0) of argument (0) is (2) in
function (overlay), expected (1) elements
fatal:["Execute.c":8640]:Execute: Error occurred at or near line 82 in file
lineplot.ncl

My script and PrintVarSummary are given below.

;create plot
;************************************
  wks = gsn_open_wks("x11","lineplot")             ; send graphics to PNG
file
  plot = new(2,graphic)                         ; create graphic array
  times = (/1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12/)
  xlabels = (/"J", "F","M","A","M","J","J","A","S","O","N","D"/)
  res                     = True
  res at gsnDraw             = False            ; don't draw
  res at gsnFrame            = False            ; don't advance frame
  res at vpHeightF = 0.40        ; Changes the aspect ratio
  res at vpWidthF  = 0.60

  res at xyMarkLineMode = "MarkLines"               ; Markers *and* lines
  res at xyDashPattern  = 0                         ; Make curves all solid
  res at xyLineThicknesses = 3.0          ; make second line thicker
  res at xyLineColors      = "black"          ; change line color
  res at xyMarkers      = 5               ; 3 different markers
  res at xyMarkerSizeF  = 0.015
  res at xyMarkerThicknesses = 3

  res at tmYROn                = False
  res at trYMinF               = 0.              ; Make sure Y axis starts at
0.
  res at trYMaxF               = 10.             ; Make sure Y axis starts at
0.
  res at trXMinF               = 0.              ; Make sure Y axis starts at
0.
  res at trXMaxF               = 13.             ; Make sure Y axis starts at
0.
  res at tiYAxisString         = ""
  res at gsnCenterString     = "SurTemp (K)"         ; change Center string
  res at gsnRightString     = ""         ; change Center string
;************
  res at tmXBMode  = "Explicit"
  res at tmXBValues      = (/1, 2, 3, 4, 5, 6, 7,8,9,10,11,12/)
  res at tmXBLabels = (/"J", "F","M","A","M","J","J","A","S","O","N","D"/)
;************
  plot = gsn_csm_xy(wks,times, obssats(:), res)
;  res at xyLineColors      = "red"          ; change line color
;  res at xyMarkerColors    = "red"
  plotb = gsn_csm_xy(wks,times, ctrlsats2(:), res)
  overlay(plot,plotb)

   draw(plot)
   frame(wks)
end
################################

VarSummary of two variables:

Variable: obssats
Type: float
Total Size: 48 bytes
            12 values
Number of Dimensions: 1
Dimensions and sizes: [time | 12]
Coordinates:
            time: [-657073..-656739]
Number Of Attributes: 13
  _FillValue : -9.96921e+36
  actual_range : ( 0.0005604419, 30.16107 )
  parent_stat : Mean
  statistic : Long Term Mean
  level_desc : Surface
  dataset : GPCP Version 2.3 Combined Precipitation Dataset
  var_desc : Precipitation
  least_significant_digit : 2
  precision : 32767
  units : mm/day
  long_name : Long Term Mean Average Monthly Rate of Precipitation
  missing_value : -9.96921e+36
  wgt_areaave_op_ncl : Area Average


ariable: ctrlsats2
Type: float
Total Size: 48 bytes
            12 values
Number of Dimensions: 1
Dimensions and sizes: [time | 12]
Coordinates:
            time: [ 588.. 599]
Number Of Attributes: 8
  surface : 0
  wgt_areaave_op_ncl : Area Average
  missing_value : 2e+20
  long_name : TOTAL RAINFALL
  units : MM/DAY
  grid_type : gaussian
  lev_type_char : surfa
  _FillValue : 2e+20
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