matplotlib/matplotlib

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kirk86

@kirk86

Anyone has any idea why animation is not working in Colab?
MWE:

fig, ax = plt.subplots()

x = np.arange(0, 2*np.pi, 0.01)
line, = ax.plot(x, np.sin(x))

def init():  # only required for blitting to give a clean slate.
    line.set_ydata([np.nan] * len(x))
    return line,

def animate(i):
    line.set_ydata(np.sin(x + i / 100))  # update the data.
    return line,

ani = animation.FuncAnimation(
    fig, animate, init_func=init, interval=2, blit=True, save_count=50)

plt.show()

I've tried using the notebook backend but to no avail. The only way I could get a plot was using rc('animation', html='jshtml') and HTML(ani.to_jshtml()). But, it produces two plots and one of them requires pressing the play button which is something I don't want. I need a plot to live update. How to achieve that?

This is what I get with HTML(ani.to_jshtml())

hannah

@story645

you can remove the first image by moving

ani = animation.FuncAnimation(
    fig, animate, init_func=init, interval=2, blit=True, save_count=50)

into a new cell, and putting %%capture at the top of the first one

Jody Klymak

@jklymak

@QuLogic I guess I don't understand how to run our benchmarks.... https://github.com/matplotlib/mpl-bench

Jody Klymak

@jklymak

ok. I figured it out I think: asv

Elliott Sales de Andrade

@QuLogic

Yea, I should write a readme...

You need airspeed-velocity, and then can do asv dev to test out a benchmark

Jody Klymak

@jklymak

I did asv.run but it didn't pick up the new file. Trying asv dev

Is there somewhere I need to tell it what files to look in? I made a new benchmarks/dates.py file...

Elliott Sales de Andrade

@QuLogic

The function should be named time_*, but I don't think there are any requirements for file names

Jody Klymak

@jklymak

Hmm, I stuck it in a class. Could move it up a level

Oh, duh I didn't name then time_

That works. Thanks!

Elliott Sales de Andrade

@QuLogic

See also https://asv.readthedocs.io/en/stable/writing_benchmarks.html if you haven't found that already

kirk86

@kirk86

you can remove the first image by moving
ani = animation.FuncAnimation(
    fig, animate, init_func=init, interval=2, blit=True, save_count=50)
into a new cell, and putting %%capture at the top of the first one

Thanks!

Jody Klymak

@jklymak

There are a couple of PRs there now...

danuo

@danuo

I want to render text with ax.text() outside of the axis and it shall not effect the spacing of constrained_layout=True . How would I make ax.text invisible to spacing calculation?

Jody Klymak

@jklymak

t=ax.text(); t.set_in_layout(False)

Or t = fig.text()?

danuo

@danuo

awesome, thank you!

hannah

@story645

@jklymak do you know the answer here https://twitter.com/nicolaskruchten/status/1318887800796778496?s=19 - I think the answer is if users provide timestamps that incorporate est/day, that's what gets plotted - but wanted to confirm.

Thomas A Caswell

@tacaswell

We have had some bug reports on this, I think that if you give us timezone aware data we "do the right thing"

Jody Klymak

@jklymak

We have a whole test for this, but I didn't see too many good examples: def test_date2num_dst()

Also def _test_date2num_dst (for some reason...)

Gilles Jacobs

@gillesjac_twitter

Hi, I'm building a figure and want to change the font on the axis and secondary axis, what's the best way to do that?

I've seen the below

        plt.yticks(fontproperties=self.font_property)

But I'm not a fan because 1) it uses pyplot instead of my figure, and 2) it only does the primary axis or the secondary axis depending on calling order (probably can do both if I call it before and after .twinx())

Gilles Jacobs

@gillesjac_twitter

Also, unrelated;

How does zorder magic work? I have some lines (zorder 2) on the primary axis (zorder 0.1), and a polycollection (zorder 1) on the secondary axis (zorder 0); my primary axis has gridlines. If I set those gridlines (ax.yaxis.get_gridlines()) to zorder 0.1 they are still on top of my poly; do I have to set some other attribute?

Jody Klymak

@jklymak

@gillesjac_twitter This is probably best discussed on discourse.matplotlib.org where you can show some code. However if by "secondary axis" you mean a twinned axes, the axes are drawn in the order in which they are added to the figure, and the z-order is on a per-axes basis

Gilles Jacobs

@gillesjac_twitter

Yeah it's a .twinx()'d one; is there any way to work around this restriction? I could transform the data from my secondary axis to the domain of the first, and plot it on the first, but I'd rather avoid such an approach

As for posting code, trying to decude a minimum example. It also doesn't help that I'm stuck (due to constraints) on an older version of matplotlib (1.5)

Actually now that I think of it, I could work around it by using a line-locator tied to my primary axis, on my secondary axis, and plotting the primary axis in front of the secondary one

hannah

@story645

https://github.com/petermckeeverPerform/themepy

hannah

@story645

@tacaswell this should link to contributing https://global.pydata.org/talks/matplotlib

Tim Hoffmann

@timhoffm

If anybody has time: PRs #17107 and #18657 would be happy about a second reviewer (first approval by @QuLogic).

Thomas A Caswell

@tacaswell

I have opened them, lets see if I can manage to read them...

Bruno Beltran

@brunobeltran

haha I too have had those two open since tuesday....

hannah

@story645

If anybody has the bandwidth, do you know about windows GUI performance issues https://discourse.matplotlib.org/

Elliott Sales de Andrade

@QuLogic

If I might second the request to look at #18657; I'd prefer not to add more deprecations that need re-importing/renaming...

hannah

@story645

:happy dance:

not all of 'em seem to actually be matplotlib, but like

Ian Hunt-Isaak

@ianhi

a whole bunch of these https://matplotlib.org/3.3.1/thirdpartypackages/index.html aren't even on there :O

hannah

@story645

Yeah, a todo on the issue is to go through and put PRs on those projects...the ones that are even still maintained (which keeping track of status is what motivated the classifier)
matplotlib/matplotlib#16592

Ian Hunt-Isaak

@ianhi

Is using 3 numbers with subplots a recommended thing?

thinking about due to https://stackoverflow.com/questions/64493821/how-do-the-subplot-indices-work-in-python

the example here https://matplotlib.org/3.3.2/api/_as_gen/matplotlib.pyplot.subplots.html doesn't seem to use that pattern at all

Elliott Sales de Andrade

@QuLogic

That's about subplot, not subplots

Ian Hunt-Isaak

@ianhi

ooooo thanks. I think that implies bedtime for me

hannah

@story645

:sleeping:

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