[ncl-talk] unable to plot scalar and vector quantities.

[Geeta Geeta]

I have to plot the GPM height, vector wind at 850 hpa.  for this i am using the 
plot = gsn_csm_vector_scalar_map_ce(wks,Uwnd850,Vwnd850,GPM850,res)     ; create a default plot

Following is the error. ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
aditya at agniilap:~/geeta/ncl/myscripts_ncl$ ncl test.ncl
 Copyright (C) 1995-2014 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.2.1
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.

Variable: a
Type: file
File path:    $NCARG_ROOT/lib/ncarg/data/cdf/test.nc
Number of global attributes:     6
Number of dimensions:     13
Number of variables:     107

Variable: GPM850
Type: float
Total Size: 260640 bytes
            65160 values
Number of Dimensions: 2
Dimensions and sizes:    [lat_0 | 181] x [lon_0 | 360]
Coordinates: 
            lat_0: [90..-90]
            lon_0: [ 0..359]
Number Of Attributes: 13
  lv_ISBL0 :    85000
  initial_time :    04/23/2015 (12:00)
  forecast_time_units :    hours
  forecast_time :    0
  level_type :    Isobaric surface (Pa)
  parameter_template_discipline_category_number :    ( 0, 0, 3, 5 )
  parameter_discipline_and_category :    Meteorological products, Mass
  grid_type :    Latitude/longitude
  _FillValue :    1e+20
  units :    gpm
  long_name :    Geopotential height
  production_status :    Operational products
  center :    US National Weather Service - NCEP (WMC)

Variable: Uwnd850
Type: float
Total Size: 260640 bytes
            65160 values
Number of Dimensions: 2
Dimensions and sizes:    [lat_0 | 181] x [lon_0 | 360]
Coordinates: 
            lat_0: [90..-90]
            lon_0: [ 0..359]
Number Of Attributes: 13
  lv_ISBL0 :    85000
  initial_time :    04/23/2015 (12:00)
  forecast_time_units :    hours
  forecast_time :    0
  level_type :    Isobaric surface (Pa)
  parameter_template_discipline_category_number :    ( 0, 0, 2, 2 )
  parameter_discipline_and_category :    Meteorological products, Momentum
  grid_type :    Latitude/longitude
  _FillValue :    1e+20
  units :    m s-1
  long_name :    U-component of wind
  production_status :    Operational products
  center :    US National Weather Service - NCEP (WMC)

Variable: Vwnd850
Type: float
Total Size: 260640 bytes
            65160 values
Number of Dimensions: 2
Dimensions and sizes:    [lat_0 | 181] x [lon_0 | 360]
Coordinates: 
            lat_0: [90..-90]
            lon_0: [ 0..359]
Number Of Attributes: 13
  lv_ISBL0 :    85000
  initial_time :    04/23/2015 (12:00)
  forecast_time_units :    hours
  forecast_time :    0
  level_type :    Isobaric surface (Pa)
  parameter_template_discipline_category_number :    ( 0, 0, 2, 3 )
  parameter_discipline_and_category :    Meteorological products, Momentum
  grid_type :    Latitude/longitude
  _FillValue :    1e+20
  units :    m s-1
  long_name :    V-component of wind
  production_status :    Operational products
  center :    US National Weather Service - NCEP (WMC)
warning:cnFillOn is not a valid resource in ce_vector at this time
warning:cnLevelSelectionMode is not a valid resource in ce_vector at this time
warning:cnMinLevelValF is not a valid resource in ce_vector at this time
warning:cnMaxLevelValF is not a valid resource in ce_vector at this time
warning:cnLevelSpacingF is not a valid resource in ce_vector at this time
warning:cnLinesOn is not a valid resource in ce_vector at this time


I m a beginner with NCL. 
Pls answer to my query. 
I am attaching my script. ;************************************************
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
begin
a=addfile("$NCARG_ROOT/lib/ncarg/data/cdf/test.nc","r")
GPM850=a->HGT_P0_L100_GLL0(20,:,:)
Uwnd850=a->UGRD_P0_L100_GLL0(20,:,:)
Vwnd850=a->VGRD_P0_L100_GLL0(20,:,:)
printVarSummary(a)
printVarSummary(GPM850)
printVarSummary(Uwnd850)
printVarSummary(Vwnd850)
; create workstation;;;;
;
wks = gsn_open_wks("png","ce")                  ; open a ps file
gsn_define_colormap(wks,"BlAqGrYeOrRe")         ; will open a coloured wks

res                           = True
;;; Contour resouces;;;;
  res at cnFillOn              = True     ; turn on color fill
  res at cnLinesOn             = False    ; turn of contour lines
;  res at cnLevelSpacingF       = 20       ; contour spacing
  res at cnLevelSelectionMode = "ManualLevels" ;manually set contour levels with following 3 resources
  res at cnMinLevelValF  = 1400            ; set the minimum contour level
  res at cnMaxLevelValF  = 1600            ; set the maximum contour level
  res at cnLevelSpacingF = 20

; Plotting data for a domain
  res at mpMinLatF            = 5.0      ; range to zoom in on
  res at mpMaxLatF            =  30.
  res at mpMinLonF            =  60.
  res at mpMaxLonF            = 120.
  res at cnLevelSelectionMode = "ManualLevels"     ; manually set the contour levels with the following 3 resources
;
; VECTOR RESOURCES

  res at vcRefMagnitudeF           = 4.0             ; define vector ref mag
  res at vcRefLengthF              = 0.045           ; define length of vec ref

  res at vcRefAnnoOrthogonalPosF   = -1.0            ; move ref vector
  res at vcRefAnnoArrowLineColor   = "black"         ; change ref vector color
  res at vcRefAnnoArrowUseVecColor = False           ; don't use vec color for ref

  plot = gsn_csm_vector_scalar_map_ce(wks,Uwnd850,Vwnd850,GPM850,res)     ; create a default plot
end


Geeta.
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