Re: [matplotlib-devel] [Matplotlib-users] ANN: mpltools 0.1 release

[Benjamin R. <ben...@ou...>]

On Tue, Jul 17, 2012 at 6:25 AM, todd rme <tod...@gm...> wrote:

> On Wed, Jul 11, 2012 at 5:23 PM, John Hunter <jd...@gm...> wrote:
> >
> >
> > On Wed, Jul 11, 2012 at 10:09 AM, Damon McDougall
> > <dam...@gm...> wrote:
> >>
> >> Well, as Ben said, that error fill plot is neato! It doesn't look too
> >> complicated, either. I'd be more than happy to port it over later today
> >> when I get bored of typing up my thesis. It'll probably only take me
> >> about 30 minutes.
> >>
> >> If nobody is opposed to this idea, I'll go ahead and submit a PR this
> >> evening (British Summer (hah!) Time).
> >
> >
> >
> > While it is a nice graph, I am not sure that the use case is common
> enough
> > to justify a new plotting method.  One can get the same result with:
> >
> >
> >   In [68]: x = np.linspace(0, 2 * np.pi)
> >
> >   In [69]: y_sin = np.sin(x)
> >
> >   In [70]: err = np.concatenate([y_sin + 0.2, y_sin[::-1] - 0.2])
> >
> >   In [71]: plot(x, y_sin)
> >   Out[71]: [<matplotlib.lines.Line2D object at 0x96959ec>]
> >
> >   In [72]: fill_between(np.concatenate([x, x[::-1]]), err,
> facecolor='red',
> > alpha=0.5)
> >   Out[72]: <matplotlib.collections.PolyCollection object at 0x962758c>
> >
> > Admittedly the [::-1] thing is a bit counter-intuitive, but rather than
> > adding a new plotting method, perhaps we would be better off with a
> helper
> > method to create the xs and ys for fill_between
> >
> >   xs, ys = mlab.pad_line(x, y, 0.2)
> >   fill_between(xs, ys)
> >
> > JDH
>
> What about adding a property to the existing errorbar to let someone
> change it to the filled version?  This could also, potentially, be
> extended with other types of error bars if the need arises.
>
> -Todd
>

Intriguing idea.  I am actually quite comfortable with that.

Ben Root