On Mar 30, 2011, at 10:34 PM, welkin zzp wrote:

> On 2011年03月31日 10:16, Ben Abbott wrote:
>> On Mar 30, 2011, at 9:53 PM, Daniel J Sebald wrote:
>> 
>>> On 03/30/2011 08:45 PM, welkin zzp wrote:
>>>> Hi,
>>>>      When I close a figure window, I observed that the gnuplot and
>>>> gnuplot_x11 processes were always in the system,but didn't work, until
>>>> quit octave . I didn't known if it's a memory leak ,but I have to
>>>> frequently quit octave after having close few figure windows. The
>>>> version of octave is 3.4.0 on ubuntu systerm.
>>> Welkin,
>>> 
>>> This topic might be more appropriate for the maintainers list, so I'm 
>>> cc'ing there.
>>> 
>>> From what I recall, Octave currently launches a separate instance of 
>>> gnuplot for each figure.  (Because gnuplot only saves the data/state for 
>>> the most current plot.)  But I'm not sure if what you describe is the 
>>> intended behavior or not, i.e., that gnuplot hangs around in case Octave 
>>> needs to use it again.  If not, perhaps you could give a more detailed 
>>> description with examples.  Maybe the behavior can be improved.
>>> 
>>> Dan
>> Welkin,
>> 
>> When you "close" a figure, do you type ...
>> 
>>      close (hfig)
>> 
>> .... or do you close the figure window using the mouse?
>> 
>> If the first, then the gnuplot session associated with the figure should 
>> terminate. However, for the latter, the gnuplot session remains open. Since 
>> there is no synchronous communication from gnuplot to octave, there is no 
>> method for Octave to become aware that the figure has been closed.
>> 
>> If this functionality is important for you, please try using the fltk 
>> backend. This can be turned on by ...
>> 
>>      graphics_toolkit fltk
>> 
>> Ben
>> 
>> 
> I have tested with the first method just now,and you are right. At first I 
> close the figure using the mouse, may be I have to notice that from now.
> By the way, is there toolbar or menu on the figure to manipulate the graphics 
> ? I think this may be more convenience . Thanks.
> 
> zzpwelkin

What exactly would you like the toolbar to manipulate?

Ben


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