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Recommended data visualization library? ggplot or matplotlib? (lemmy.sdf.org)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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So I'm considering going deep into a data viz library, and I'm wondering what you people think. I'm not asking reddit because I know for a fact that all the hardcore people that know their stuff are on lemmy.

Here are my requirements:

API must at least pretend to be reasonably designed.
- I know that viz libraries are complex. But I want something with carefully chosen primitives that scale reasonably well from "data goes in, chart goes out" to nit-picky adjustments.
Defaults must not be ugly.
- Or at least there should be an easy way to bypass the default ugliness. I know that design is subjective, but how am I supposed to trust a library that operates on the visual space and yet decides that a bad default is ok?
- Here looks like ggplot has the upper hand. But there is a stylesheet that makes matplotlib look like ggplot, so maybe that's not a big problem.
Must have a future.
- The github contribution chart on matplotlib just keep going up, it's insane. While ggplot not so much. But maybe it's hard to compete with the python hype machine, and that is that.
Bonus points if interactive and renders to web too.

Non-requirements:

Easy learning curve.
- I am a hardcore programm0r. I like it rough, as long as it's worth the effort.
Heavy math stuff.
- I'm not designing rockets or wind turbines. I just want a way to visually represent data as lines, charts, pies, or maps, or maybe violins if I'm feeling fancy.

Thanks

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[–] [email protected] 3 points 1 year ago (2 children)

I went with ggplot2 some time ago, despite not using or knowing R at all. What pushed me in that direction was that I was using other plotting libraries (I don't recall which at the time), and there was some aspect of spacing between elements or some such that was making a particular plot look ever so slightly ugly in my eyes... and I couldn't fix it!

In my frustration, I consciously decided to set aside my version of your "reasonably designed" requirement (I find R consistently frustrating in this regard, though I know some people do all their programming in it and I salute them). I gave ggplot2 a try with a cargo culting approach: search for how to make the kind of plot you want to make, and just tweak that template. I was blown away. I could find recipes for everything I wanted to do, the results were instantly more attractive than what I had before, and I could tweak everything.

matplotlib is absolutely a reasonable option, but even years later I still have R environments attached to most projects specifically for data visualization, and still produce plots that are delightfully aesthetic. So here's one voice to say that ggplot2 has real merit, especially if your aim is specifically to produce visualizations rather than explore a programming ecosystem.

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

Just about everything is modifiable in matplotlib... It may not be easy, but all plotting libraries are designed to make some things easy at the expense of making other tasks more difficult. For matplotlib you just have to think about things the way matlab thinks about things... which is more computer graphics based. It can get ugly until you understand it. But if you understand how any plotting library actually works it's not that bad. All plotting libraries ultimately are built on graphical primitives like lines and fonts and triangles and patches computing where things belong by transforming coordinates and feeding them to a layout engine. It's not as magical as the APIs make them seem. So if you're willing to dig into their bowels (as OP mentions) there really aren't any many limits. Sometimes it's actually easiest to just declare a canvas in memory and draw it all by hand. Ultimately, things are either vector or raster formats (or some abstraction that supports both) and fed into some computer graphics engine (like postscript or some OS's or GPU canvas).

Anyway, sometimes the easiest answer is you export and edit the labels in the final figure. One really nasty way if you don't have PS or PDF tools is to sidetrack through Windows EMF and mess with fonts and positioning of text in PowerPoint.

[–] [email protected] 1 points 1 year ago

Interesting. This matches my one experience using ggplot2, in which I found it easy to modify existing code. Looks like the library works very well with the "cargo cult" approach