Re: [matplotlib-devel] label= kwarg for imshow() and other scalarmappable plots

In general I like the idea, but I'm not sure what behaviour I would expect
in this case:

plt.imshow(z, label='foobar')
plt.imshow(z, label='wibble')
plt.colorbar()

I suppose it is an analogous problem to:

plt.imshow(z, cmap='hot')
plt.imshow(z, cmap='jet')
plt.colorbar()

Which produces a colorbar for the [current scalar mappable]/gci.

On that basis, I've just convinced myself that your proposal is a good
idea, so +1 from me.





On 25 March 2013 07:03, Eric Firing <ef...@ha...> wrote:

> On 2013/03/24 12:14 PM, Benjamin Root wrote:
> > So, for plot(), scatter() and other plotting functions, we can provide a
> > label= kwarg so that a legend() can automatically populate the legend,
> > making it extremely easy and convenient for making legends.  But for
> > image-based (scalar mappable) type plotting functions like imshow() and
> > contourf(), the label kwarg doesn't do anything useful, but the
> > colorbar() is sort of analogous to a legend(), but for scalar mappables.
> >
> > Does it make sense to others for the following to be equivalent:
> >
> >  > plt.imshow(z)
> >  > cbar = plt.colorbar()
> >  > cbar.set_label('foobar')
> >
> >  > plt.imshow(z, label='foobar')
> >  > plt.colorbar()
> >
>
> I understand your argument, but it feels a bit odd.  To me it would be
> more natural for colorbar() itself to accept a label kwarg.  I have no
> idea why I didn't do that long ago.
>
> The two ideas are not mutually exclusive.
>
> Eric
>
> >
> > I found that it is a small change to make this work, I just wanted to
> > know if others think this makes sense before putting in the time to add
> > documentation, modify examples and such.
> >
> > Cheers!
> > Ben Root
> >
> >
> >
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