problem with interaction of plotyy/clf/delete

[Ben Abbott]

On Monday, November 24, 2008, at 05:02AM, "David Bateman" <David.Bateman at motorola.com> wrote:
>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.

Yes, that works for me.

Thanks

Ben