matplotlib markers not showing up...

[drjmcauliffe]

In some over zealous pre-workshop preparation I cloned the repo and attempted a quick run through of some of the code... when I use plt.plot(x, y, 'o') or similar the 'o' doesn't appear in the resulting plot... nor do other 'x', '.', ',' etc. If I leave it out altogether I get a line plot. I'm in a venv with the following installed:

stroML==0.2
astropy==0.4.2
emcee==2.1.0
ipython==2.3.0
matplotlib==1.4.2
numpy==1.9.0
pandas==0.15.0
scikit-learn==0.15.2
scipy==0.14.0
seaborn==0.4.0

Python 2.7.8... any ideas? Looking forward to a busy week of learning.

J.

P.S. the semicolon at the end of the plt.plot(); ... brilliant! Been looking for that for months...

[jakevdp]

No idea. That's really strange.

[jakevdp]

What if you set the color, like plt.plot(x, y, 'ob')?

[drjmcauliffe]

With 1.4.2 and 1.4.1 I couldn't get the markers to appear - even by adding the colour letter... but with 1.4.0 everything works as in your original notebook example. Dunno what's changed in the latest releases but I'll stick with 1.4.0 for the workshop... what version did you use for the the notebook preparation? Might it be 1.4.0 also?

[jakevdp]

Yep, I'm using 1.4.0

[patricksurry]

I'm having this same problem with matplotlib 1.4.2, but only if I use 'png' inline backend. If I switch to svg then the markers appear:

%config InlineBackend.figure_format = 'svg'

[patricksurry]

Discovered a lengthy thread here: mwaskom/seaborn#344

sounds like a matplotlib issue they're fixing.

[xiyuyi]

I encountered the same problem.

In my case, it seems like the problem was caused by seaborn that I imported after matplotlib.

without importing seaborn, the markers show up just fine.