change in array index - no different in graphics result!!!

Dear NCL Users, I need to plot a contour with lat in reverse. I use to this:  var(::-1,:), to plot reverse lat and all lon but my plots in both condition, are same!I want to show this change in output graphics result but I can not. var(:,:) and var(::-1,:) are not different in graphics output, why?? can any one help me please? Dose any one have any suggestion to solve this problem? Thanks in advance! Marzie ----------------------------------------------------------------------------------- This is the header of input file: ----------------------------------------------------------------------------------- path:    output.nc    file global attributes:    dimensions:       lat = 181       lon = 261    variables:       float rainfall ( lat, lon )          units :    mm/day          _FillValue :    -100000       float lat ( lat )          standard_name :    latitude          endValue :    50.125          startValue :    4.875          stride :    0.25          numberOfElements :    181          units :    degrees_N       float lon ( lon )          standard_name :    longitude          endValue :    85.375          startValue :    20.125          stride :    0.25          numberOfElements :    261          units :    degrees_E ---------------------------------------------------------------------------------- and this is the variable's details : ---------------------------------------------------------------------------------- Variable: rainfall Type: float Total Size: 188964 bytes             47241 values Number of Dimensions: 2 Dimensions and sizes:    [lat | 181] x [lon | 261] Coordinates:             lat: [4.875..50.125]             lon: [20.125..85.375] Number Of Attributes: 2   units :    mm/day   _FillValue :    -100000 ---------------------------------------------------------------------------- and this is my script for plotting: ---------------------------------------------------------------------------- load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl" load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl" begin      wks = gsn_open_wks("x11","out")      gsn_define_colormap(wks,"WhBlGrYeRe") ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;      inf = addfile("output.nc","r")      var = inf->rainfall(::-1,:)           ; here is my question! not diffrent between (:,:) and (::-1,:), why???? ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;   res = True   res@gsnAddCyclic          = False   res@cnFillOn                   = True   res@gsnSpreadColors      = True   res@lbOrientation            = "Vertical"   res@gsnMaximize            = True   res@lbLabelAutoStride    = True   res@cnLinesOn                = False   res@cnLevelSelectionMode  = "ManualLevels"   res@cnMinLevelValF           = 0   res@cnMaxLevelValF          = 50   res@cnLevelSpacingF          = 0.5 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;   plot = gsn_csm_contour(wks,var,res)

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Received on Sun Nov 11 22:16:05 2012