Yes, for efficiency reasons matplotlib will use a reference to original
data whenever possible, rather than copying it. Also, when using the
pylab/pyplot API, matplotlib figures also stay around until they are
explicitly deleted. You may need an explicit call to "clf('all')" to
remove the figures, and thus references to the memmap'd file.
However, my advice would be to just not use memmap. I can't imagine
matplotlib performs very well if the data can't all fit in memory, so
you might as well just load it all into memory anyway.
Mike
Mathew Yeates wrote:
> There is definitely something wrong with matplotlib/numpy. Consider
> the following
> >from numpy import *
> >mydata=memmap('map.dat',dtype=float64,mode='w+',shape=56566500)
> > del mydata
>
> I can now remove the file map.dat with (from the command line) $rm map.dat
>
> However
> If I plot mydata before the line
> > del mydata
>
>
> I can't get rid of the file until I exit python!!
> Does matplotlib keep a reference to the data? How can I remove this
> reference?
>
> Mathew
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now. http://p.sf.net/sfu/bobj-july
> ------------------------------------------------------------------------
>
> _______________________________________________
> Matplotlib-devel mailing list
> Matplotlib-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>
--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
Crystal Reports now. http://p.sf.net/sfu/bobj-july
_______________________________________________
Matplotlib-devel mailing list
Matplotlib-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
