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From: Mary Haley (haley AT ucar.edu)
Date: Sat Oct 16 2004 - 08:53:54 MDT

  • Next message: MUHTARJAN osman: "Some questions about "contours on contours""

    >
    > hello!
    >
    > Thank you for your attention!
    >
    > I using :
    >
    > gsn_define_colormap(wks,"BlAqGrYeOrReVi200")
    > vcres@gsnSpreadColors = True ; use full colormap
    > vcres@gsnSpreadColorEnd = 193 ; last color to use
    > vcres@gsnSpreadColorStart = 6 ; first color to use
    > i = NhlNewColor(wks,0.7,0.7,0.7)
    > vcres@vcGlyphStyle = "CurlyVector"
    >
    > plot(0)=gsn_csm_vector_scalar_map_ce(wks,diff2(5,:,:),diff3(5,:,:),diff1(5,:,:),vcres)
    >
    > I get a colorbar for temperature from
    > -1.6,-1.4,-1.2,-1.0,-0.8,-0.6,-0.4,-0.2,0,0.2,0.4,0.6,0.8,1,1.2,1.4
    >
    > but I want change it to
    > -1.4,-1.2,-1,-0.8,-0.6,-0.4,-0.2,0,0.2,0.4,0.6,0.8,1,1.2,1.4
    >
    > I try this :
    > cmap = RGBtoCmap("/home/ncl/rgb_files/diag16.rgb")
    > gsn_define_colormap(wks,cmap)
    > vars = (/"diff2"/)
    > nvars = dimsizes(vars)
    > cntrs = new ((/nvars,15/),float)
    > cntrs(0,:)=(/-1.4,-1.2,-1,-0.8,-0.6,-0.4,-0.2,0,0.2,0.4,0.6,0.8,1,1.2,1.4/)
    >
    > vcres@cnLevelSelectionMode="ExplicitLevels"
    > vcres@cnLevels = cntrs(0,:)
    >
    > but do not work, I got an answer is
    > warning:cnLevels is not a valid resource in
    > /DJFcmtctldiff79-98TUV850hPa_vector at this time
    > warning:cnLevelSelectionMode is not a valid resource
    > in /DJFcmtctldiff79-98TUV850hPa_vector at this time
    >
    > So do any suggestion can give me to change the the
    > colorbar ?
    >
    > Thank you very much!
    >
    > Best wishes!
    > liping

    Dear Liping,

    By default, when you use the "gsn_csm_vector_scalar_map_ce" function,
    the scalar field is used to color the vectors by, *not* to draw a
    separate contour plot.

    If you want the scalar field to be drawn as a separate contour plot,
    then set the special resource "gsnScalarContour" to True:

      vcres@gsnScalarContour = True

    Your "cn" resources should now be recognized by the function.

    For more information, please see the first example at:

        http://www.cgd.ucar.edu/csm/support/CSM_Graphics/vector.shtml

    --Mary
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