Fix mlab.rec_join.

[anntzer]

examples/misc/rec_lab_demo.py was broken on Python3.

Any plans to just deprecate most of mlab? I can see why it's there but nowadays pandas and friends are much more appropriate for this kind of stuff.

[tacaswell]

Yes, but we do not have any idea what people are actually using. For example the LIGO notebooks used some stuff from mlab (the power spectrum).

[anntzer]

Well, won't a standard deprecation cycle be enough?

[WeatherGod]

This stuff has been in matplotlib for a very long time. We would need a
few cycles for deprecation, and we should be providing clear replacements
in the deprecation notes.

On Mon, Jun 13, 2016 at 2:24 PM, Antony Lee notifications@github.com
wrote:

Well, won't a standard deprecation cycle be enough?

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[anntzer]

I certainly understand, and wouldn't have suggested it if I didn't find parts of the code that are broken. The alternative would be to improve the coverage, which is so-so right now (this is actually the kind of code for which high coverage could be achieved).

[QuLogic]

Indirectly backported to v2.x as cbec32b via #6868.