[ncl-talk] gsnPanelLabelBar with gsn_csm_blank_plot

[Mary Haley]

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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