<div dir="ltr"><div>That function &quot;span_color_indexes&quot; was introduced with NCL v 6.2.0.  Do you have an older version of NCL?<br><br></div>Rick<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 4, 2015 at 9:38 AM, Jiang, Lifen <span dir="ltr">&lt;<a href="mailto:lfjiang@ou.edu" target="_blank">lfjiang@ou.edu</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




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Hi Mary,
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<div>Thank you very much for writing the script for me! But it showed below error when I ran it. I have attached the script and my data file again. It will be helpful if you or anybody else can help tell the problem.</div>
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<div><span style="font-size:12pt">fatal:Undefined identifier: (span_color_indexes) is undefined, can&#39;t continue</span></div>
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<div>fatal:Execute: Error occurred at or near line 23 in file diff_test.ncl</div>
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<div>Thanks again,</div>
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<div>Lifen </div>
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<p class="MsoNormal"><span style="color:#a7bce3">______________________________</span></p>
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<div style="direction:ltr"><font color="#000000" face="Tahoma"><b>From:</b> Mary Haley [<a href="mailto:haley@ucar.edu" target="_blank">haley@ucar.edu</a>]<br>
<b>Sent:</b> Tuesday, March 03, 2015 3:29 PM<br>
<b>To:</b> Jiang, Lifen<br>
<b>Cc:</b> <a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@ucar.edu</a><br>
<b>Subject:</b> Re: [ncl-talk] White for zero in a map<br>
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<div class="gmail_default" style="font-size:small">There are many ways you can do this.</div>
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<div class="gmail_default" style="font-size:small">I&#39;ve attached a script that does this by using the cnFillColors resource to specify a list of color indexes into the &quot;rainbow&quot; color map, but then I changed the color index that represents level 0.0 to be 0
 (the background color, and therefore white).</div>
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<div class="gmail_default" style="font-size:small">--Mary</div>
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<div class="gmail_quote">On Sun, Mar 1, 2015 at 3:01 PM, Jiang, Lifen <span dir="ltr">
&lt;<a href="mailto:lfjiang@ou.edu" target="_blank">lfjiang@ou.edu</a>&gt;</span> wrote:<br>
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<div class="gmail_extra">Hello, </div>
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<div class="gmail_extra">I was trying to create a map of the attached variable. The min and and max are -14 and 18, respectively.</div>
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<div class="gmail_extra">I would like to set white for zero, but could not work out how to make it. Script is at the end of this email.</div>
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<div class="gmail_extra">Could anybody help with my issue?</div>
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<div class="gmail_extra">I appreciate your time and help!</div>
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<div class="gmail_extra">Thanks,</div>
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<div class="gmail_extra">Lifen</div>
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<p><span style="font-family:宋体">;************************************************<br>
load &quot;$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl&quot;   <br>
load &quot;$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl&quot;  <br>
load &quot;$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl&quot;  <br>
<br>
begin<br>
<br>
  in = addfile(&quot;Diff.nc&quot;,&quot;r&quot;)<br>
  t  = in-&gt;Diff<br>
  t@_FillValue  = -999<br>
  t@missing_value = t@_FillValue<br>
<br>
  printVarSummary(t)<br>
<br>
  wks = gsn_open_wks(&quot;png&quot; ,&quot;Plot_Diff&quot;)                ; <br>
  gsn_define_colormap(wks,&quot;rainbow&quot;)        ; choose colormap<br>
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  res                       = True     ; plot mods desired<br>
<br>
  res@cnFillOn              = True     ; turn on color fill<br>
  res@cnLinesOn             = False    ; turn off contour lines<br>
  res@cnLevelSpacingF       = 3      ; contour spacing<br>
<br>
;---This resource not needed in NCL V6.1.0<br>
  res@gsnSpreadColors       = True     ; use full range of color map<br>
<br>
  res@lbLabelStride         = 1<br>
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  res@pmTickMarkDisplayMode = &quot;Always&quot;; use NCL default lat/lon labels<br>
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  res@gsnAddCyclic          = False    ; data already has cyclic point<br>
                                  ; this must also be set for any zoom<br>
<br>
; note that the gsn_csm_*map_ce templates automatically set <br>
; res@mpLimitMode=&quot;LatLon&quot; for you. If you are plotting a different projection,<br>
; you may have to set this resource.<br>
<br>
  res@mpMinLatF            = -90      ; range to zoom in on<br>
  res@mpMaxLatF            =  90<br>
  res@mpMinLonF            = -180<br>
  res@mpMaxLonF            = 180<br>
  <br>
  res@cnLevelSelectionMode = &quot;ManualLevels&quot;<br>
  res@cnMinLevelValF       = -15<br>
  res@cnMaxLevelValF       = 20<br>
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  plot = gsn_csm_contour_map_ce(wks,t({-90:90},{-180:180}), res)<br>
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