CEM mod

[SoniEx2]

The % operator is missing.

[sp614x]

The expressions are operating only on float values and % is not defined for floats.
It could be simulated like:
x % y = ((x / y) - (int)(x / y)) * y

[SoniEx2]

What about x % y = x - floor(x / y) * y?

[sp614x]

Practically the same, but it does not work for negative X.
First version works identical to % for negative numbers.

[SoniEx2]

The Lua version is saner than the Java version. Let me look up that paper or w/e it was...

[SoniEx2]

Meh, couldn't find it...

[SoniEx2]

Thanks to the Lua mailing list I found these:

http://hisham.hm/2015/04/18/a-small-practical-example-where-luas-behavior-is-better-than-cs/ (this is the one I was talking about)

https://www.microsoft.com/en-us/research/publication/division-and-modulus-for-computer-scientists/

[sp614x]

Not sure which one should be implemented.
The Java version is compatible with most existing C-like languages.
The Lua version is more practical.
Maybe implement "%" as Java defines it and add "mod" as the Lua version?

[SoniEx2]

Lua has math.fmod as Java's (well C's really) %. I personally prefer the idea of % as Lua defines it and mod as Java defines it.

[sp614x]

For me defining "%" like Java and "mod" like Lua is the better way. Most other languages (except Lua) define "%" in the C/Java way (the result sign differs a bit).

Most of the time "%" is used as "x % y == 0" in order to trigger an action every "y" steps. For this usage both implementation are working correctly and the practical difference will be minimal.

Java has the Lua mod as Math.floorMod() so I could use "fmod" for it.

[sp614x]

Added:

• operator "%" - similar to Java "%"
• function "fmod(x,y)" - similar to Math.floorMod()