Hi Simon,
On 3/8/07, Simon Wood <[EMAIL PROTECTED]> wrote:
> On 3/8/07, Fernando Perez <[EMAIL PROTECTED]> wrote:
> > Hi all,
> >
> > today at work we ran into some odd behavior, all of which seems to be
> > triggered by calling hold(). I'm using a fresh SVN build from this
> > afternoon.
> >
> > Here's the first example demonstrating the problem, it's best to run
> > this in a fresh pylab shell or from the command line, since I suspect
> > internal state matters (when it shouldn't):
> >
> > import pylab as P
> >
> > x = P.arange(10)
> > y = x+1
> >
> > P.figure()
> > P.plot(x,label='one')
> > P.plot(y,label='two')
> > P.legend()
> > P.title('Two plots ok')
> >
> > P.figure()
> > P.hold(True)
> > P.plot(x,label='one')
> > P.plot(y,label='two')
> > P.legend()
> > P.title('Two plots ok - HOLD called')
> > P.hold(False)
> >
> > P.figure()
> > P.plot(x,label='one')
> > P.plot(y,label='two')
> > P.legend()
> > P.title('One plot MISSING!')
> >
> > P.show()
> >
> > #### EOF
> >
>
> I do not think this is a bug. The default value for the hold function is
> True. When you originally plotted x and y the hold state was already set to
> True. So, actually your first case and second case are the same. However,
> right before your third figure you set P.hold(False) . You then plot x
> followed by y. So, yes I would expect to see only one line in the final
> figure. This is exactly like Matlab (perhaps with the exception that the
> default state of hold is False in Matlab). Perhaps that is what is confusing
> you and your colleague. In Matlab the default state of hold is False,
> however in Matplotlib is looks like the default state of hold is True.
Many thanks for your clear explanation. Since I had never used hold
(or matlab for that matter) in my life, I was rather surprised by the
behavior and (mis)understood it as a bug.
I've always gotten by just fine in pylab without even knowing what
hold did, and simply clearing the figure by hand when needed or just
making a new one.
Sorry for the noise.
Regards,
f
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
