[ncl-talk] Overlay on two plots

[James Russell]

Carl,

I haven’t had a chance to check since I’m on my phone but I think that’s
happening because you’ve got the overlay order reversed. The base plot
should be the first index. The overlay should be the second. I think you
should have:

overlay(a,b)
overlay(a,c)

What I think you are doing is overlaying a onto b, and then trying to
overlay a onto c. But a is already an overlay on b, hence why you are
getting that error.

Thanks,
James

On Fri, Jan 4, 2019 at 8:02 AM Carl Schreck <cjschrec at ncsu.edu> wrote:

> Is there any workaround to be able to overlay one plot onto two others?
> i.e.,
>
> a = gsn_csm_contour( wks, aData, res )
> b = gsn_csm_contour( wks, bData, res )
> c = gsn_csm_contour( wks, cData, res )
>
> overlay( b, a )
> overlay( c, a )
>
> That gives the error:
> fatal:NhlAddOverlay: tranform is already an annotation or overlay: 30
>
> I tried simply copying a:
> a = a2
> overlay( b, a )
> overlay( c, a2 )
>
> But that gives the same error. I know it's not too difficult to call the
> plotting routine twice. But a lot of times I have graphics as return values
> from functions, so it'd be nice if there were some kind of copy_graphics
> function so I wouldn't have to run those again.
>
> First world problems, but figured I'd ask... Thanks!
> Carl
>
> --
>
> <https://ncics.org/> *Carl J. Schreck III, PhD*
> *Research Scholar*
> North Carolina State University <http://ncsu.edu/>
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-- 
This message was sent from my mobile device. Sorry for the brevity!

go.ncsu.edu/james-russell
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