problem with interaction of plotyy/clf/delete

[David Bateman]

Ben Abbott wrote:
> As deleting one axis of plotyy group results in the other axis being  
> deleted, the clf() function results in an attempt to delete an axis a  
> second time.
>
> 	demo plotyy
> 	clf
>
> 	error: delete: invalid graphics object (= -15.2239)
> 	error: called from:
> 	error:   /Users/bpabbott/Development/mercurial/octave-3.1.51/scripts/ 
> miscellaneous/delete.m at line 40, column 1
> 	error:   /Users/bpabbott/Development/mercurial/octave-3.1.51/scripts/ 
> plot/clf.m at line 78, column 1
>
> How should this be resolved?
>
> Shall delete() or __go_delete__ be modified ?
>
> As the existence of the parent is already verified by __go_delete__ it  
> seems that it would be appropriate the check that a call back hasn't  
> deleted one of the figure's children.
>   
Yes that might be an idea, but how do you verify that the callback did 
the deleting and its not just an invalid handle? What I'd suggest doing 
is check the validity of all handles to be deleted first in 
F__go_delete__ and then in the main loop if the handle doesn't exist 
just ignore it..
> I took a shot at changing graphics.cc to fix the problem, but it  
> persists (my c++ skills are practically non-existent). I expect a  
> proper solution is trivial, but still beyond me :-(
>   
Try the attached

D.


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David Bateman                                David.Bateman at motorola.com
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