epsilon VS crazyflie-firmware

I've engaged in debates on HN about the definition of "open source" in the past, so there might be some disagreement about the meaning of the title.

I've settled on using "OSI open source" to avoid this, since those discussions are uniformly tiring and unproductive.

That said, I agree with parent: the repo specifically has a section regarding copyright and it simply says that all rights are reserved[0]. This is proprietary software, disallowing copying, distribution, and derivative works. It's weird, since even cloning the repo appears to be a violation of their stated terms, though they supply instructions for building the software yourself that of course requires copying the code to your machine first[1].

Copyright is weird.

[0]: https://github.com/numworks/epsilon#copyright

[1]: https://www.numworks.com/resources/engineering/software/buil...

They still are open source [1].

If I had to guess, the reason they locked the bootloader is the same reason they removed the symbolic math functionality (which is re-added in Omega [2]), test accreditation.

They want to create a calculator to provide a good and viable alternative to TI. They can only do that if their calculator is allowed on tests like the ACT, SAT, etc.

[1]: https://github.com/numworks/epsilon

Yes, you can compile it yourself from source, but the Python app isn't very stable since some file is only adapted to x86-64 and not ARM. E.g. mandelbrot(20) crashes directly. https://github.com/numworks/epsilon/issues/1642

Yes : https://github.com/numworks/epsilon/pull/534

Jokes aside, the epsilon firmware that's powering the NumWorks calculators is Unicode-capable. Specifically, https://github.com/numworks/epsilon/blob/master/kandinsky/fonts/code_points.h is the list of codepoints supported by the firmware. Some of them have special purposes, for example codepoints around 0x300-0x36F are combining diacritical marks meant to be combined with other codepoints.

That is beautiful. I wish the company great success.

> Epsilon is a high-performance graphing calculator operating system.

> It includes eight apps that cover the high school mathematics curriculum.

https://www.numworks.com/resources/engineering/software/

https://github.com/numworks/epsilon

Looks like this single codebase is used to build for the calculator device, and all targets for the simulator: Android, iOS, macOS, Windows, and the web.

> NumWorks Epsilon is released under a CC BY-NC-SA License.

Attribution-NonCommercial-ShareAlike 4.0 International - https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode

Indeed, for the equation graph, it should be possible in v17 according to https://github.com/numworks/epsilon/issues/1787

You can't plot implicit graph yet, but that's in numworks mind (see the link). Currently, the only solution you have is to convert it to parametric, and change the setting of the function.

Check out the source code for the crazyflie drone https://github.com/bitcraze/crazyflie-firmware