(Request) Trigonometry and more math functions?

[dogevspenguin]

I am wondering how would I be able to use trigonometric functions, As Bend looked quite promising for a speed-up In a project I've been doing, But it requires the usage of trigonometric functions such as sin, cos tan, and even inverse function. So is it possible to add these math functions?

[developedby]

We can implement them as an approximation in Bend using the already existing operations, but I think they should exist as HVM operations.
I created this issue to track that HigherOrderCO/HVM#384, but if you want to use them right now look into the approximations like I said.

If by inverse you mean x^-1, you can already do that with the ** (pow) operator.

If by inverse you mean arcsin, arccos and arctan, HVM already implements atan2, it's just not exposed in Bend.
You can hack them in by using the internal representation of bitwise operations.

• a & b = atan2(a, b), arctan(a / b)
• a | b = log(a, b), log_b(a)
• a ^ b = pow(a, b), a^b

[developedby]

With HigherOrderCO/HVM#384 done, we can now work on implementing it on Bend.
The same approach that was used for the other f24 primitives can be used here.

[developedby]

HVM implements sin(x + y) using the [<<] operator and tan(x + y) with the [>>] operator.
We can implement them in builtins.bend like we did the others, using a native hvm definition for sin(x) = (<< x 0.0). Cosine can be the same thing but + pi/2.