[ncl-talk] 'gsn_csm_pres_hgt_vector' hanging when trying to run an NCL script

[Dennis Shea]

Also, perhaps,

    res@*vcMinDistanceF *  = 0.017            ; thin out vectors
                                                                   ; may
require a bit of trial an error
                                                                   ; this
resource works well



On Wed, Jan 27, 2021 at 3:45 PM Adam Phillips via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi Chris,
> I would guess that NCL is trying to draw many vectors in a tiny space, and
> that that is why the plotting function call is just hanging. I would
> suggest plotting every 2nd or 3rd vector and see if you can see any results:
>
> *    plot(0) = gsn_csm_pres_hgt_vector(wks, Zonal_DJF_U_anomaly(::2,::2),
> Zonal_DJF_vstar_anomaly(::2,::2), Zonal_DJF_wstar_anomaly(::2,::2), res)*
>
> If that results in a plot, my guess was correct. You can also adjust the
> vector lengths and thicknesses and such and/or set vcMinDistanceF to make
> the vectors less dense. See the top of the vectors applications page here:
> http://www.ncl.ucar.edu/Applications/vector.shtml
> Hope that helps!
> Adam
>
> <http://www.ncl.ucar.edu/Applications/vector.shtml>
>
>
> On Wed, Jan 27, 2021 at 12:38 PM Christopher Maloney via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> To whom it may concern,
>>
>>  I am trying to plot a pressure/height vs. latitude plot of zonal winds
>> with WV wind vectors overlaid on top. I've been trying to follow the
>> example shown in '
>> https://www.ncl.ucar.edu/Applications/Scripts/vector_5.ncl' and use the
>> 'gsn_csm_pres_hgt_vector' function, but every time the script gets to the
>> point where it calls that function it just hangs and does nothing. I can
>> successfully run 'gsn_csm_pres_hgt' and produce a plot with all of my
>> variables so I know that they are formatted properly. I am using NCL
>> version 6.6.2 so I don't think it is a version issue. I've pasted my
>> plotting code below. Any advice would be greatly appreciated.
>>
>> Plotting Script (the script hangs on the first plot(0) call):
>>
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>> *  wks = gsn_open_wks("png",
>> "/Users/cmaloney/Other_NCL_scripts/images/zonal_avgs/diff_plots/" + runa +
>> "_" + runDef + "seasonal_wind_anomalies")  plot = new(2,graphic)      res =
>> True  res at gsnDraw = False  res at gsnFrame = False   res at cnFillOn         =
>> True                  res at cnLinesOn        = False
>> res at trYMinF          = 1.0    res at cnFillPalette     = "BlueDarkRed18"
>>   res at lbTitleString    = "Delta (m/sec)"    res at lbTitlePosition  = "Bottom"
>>      res at tiYAxisString     = "Pressure (hPa)"    res at tmYLMode = "Explicit"
>>   res at tmYLValues = (/ 850, 500, 300, 200, 150, 100, 70, 50, 30, 10, 1 /)
>> res at tmYLLabels = (/ "850", "500", "300", "200", "150", "100", "70", "50",
>> "30", "10", "1" /)    res at cnLevelSelectionMode = "ManualLevels"
>> res at cnMaxLevelValF       = 2    res at cnMinLevelValF       = -2
>> res at cnLevelSpacingF      = 0.1    res at pmLabelBarOrthogonalPosF = 0.025
>> res at vcMapDirection = False    res at vcGlyphStyle    = "CurlyVector"      ;
>> turn on curly vectors       plot(0) = gsn_csm_pres_hgt_vector(wks,
>> Zonal_DJF_U_anomaly, Zonal_DJF_vstar_anomaly, Zonal_DJF_wstar_anomaly,
>> res)        plot(1) = gsn_csm_pres_hgt_vector(wks, Zonal_JJA_U_anomaly,
>> Zonal_JJA_vstar_anomaly, Zonal_JJA_wstar_anomaly, res)  resP
>>    = True  resP at gsnFrame         = False
>> resP at gsnPanelLabelBar = True                    resP at lbLabelFontHeightF =
>> 0.015   resP at gsnPanelBottom   = 0.2   resP at gsnPanelTop      = 0
>> resP at gsnPanelYWhiteSpacePercent = 5.  resP at gsnPanelXWhiteSpacePercent = 5.
>> resP at gsnPanelMainString = "Wind Anomalies"
>> gsn_panel(wks,plot,(/1,2/),resP) *
>>
>> *    draw(plot)*
>> *    frame(wks)*
>>
>>
>>
>> Thanks for your help,
>> - Chris
>>
>> --
>> Christopher Maloney
>> Professional Research Associate
>> CIRES at the University of Colorado/NOAA Chemical Sciences Lab
>>
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>
>
>
> --
> Adam Phillips
> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/   303-497-1726
>
> <http://www.cgd.ucar.edu/staff/asphilli>
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