[ncl-talk] gsnPanelLabelBar with gsn_csm_blank_plot

[Daniel Adriaansen - NCAR]

Hi Mary,

This works great! I was hoping that this resource applied to more
attributes about the plot than just the scale factor. Sure enough, it
worked for the colorbar as well.

Thanks!

-Dan

On Fri, Aug 24, 2018 at 7:59 AM Mary Haley <haley at ucar.edu> wrote:

> Hi Dan,
>
> The issue is that the first plot in the list is always the one that gets
> used to determine the fill colors for the common labelbar. When you make
> that the blank plot, then, it fails.
>
> I've created a ticket to fix the code to handle this more gracefully
> (NCL-2768), but meanwhile I think you can work around this by telling
> gsn_panel to use a different plot for determining both the size and the
> colorbar:
>
> pres at gsnPanelScalePlotIndex = 1
>
> The default is to use the first plot (0), so by setting it to 1, it will
> use the second plot in your array of plots.
>
> If this doesn't work, then could you provide me with your script so I can
> see what else might be going on?
>
> Thanks,
>
> --Mary
>
>
> On Thu, Aug 23, 2018 at 1:53 PM, Daniel Adriaansen - NCAR <
> dadriaan at ucar.edu> wrote:
>
>> Hello,
>>
>> I am paneling some contour plots using gsn_panel. Each panel is a contour
>> plot corresponding to different data from unique files. If a file is
>> missing, in lieu of calling gsn_csm_contour, I call gsn_csm_blank_plot to
>> keep the workspace symmetric. This works except when gsn_csm_blank_plot is
>> the "upper-left-most" panel. In that case, gsn_panel fails and returns the
>> error:
>>
>> fatal:Variable (mono_fill_scl) is undefined
>>
>> I found this old ncl-talk ticket from 2017:
>> http://mailman.ucar.edu/pipermail/ncl-talk/2017-April/008585.html
>>
>> There it describes how the gsnPanelLabelBar resource doesn't play nicely
>> when the plots being paneled are X-Y plots. Indeed, when I set this
>> resource to False my code runs successfully, however I am not creating any
>> X-Y plots. To make matters more confusing, if I call gsn_csm_blank plot in
>> any other position than the "upper-left-most", then it works just fine.
>> It's only when the "upper-left-most" panel is gsn_csm_blank_plot that my
>> script fails.
>>
>> It looks like based on the NCL documentation that "The common label bar
>> is draw from the first plot, and assumes all are the same." (
>> https://www.ncl.ucar.edu/Applications/panel.shtml). Also on that page, I
>> see a resource called "gsnPanelScalePlotIndex", which is used to control
>> which plot in the list of plots to panel to obtain scale factor information
>> from. Is there a way to control the same thing but for the common label bar?
>>
>> Thanks in advance!
>>
>> -Dan
>>
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