zig/lib/std/math/complex/atanh.zig
Andrew Kelley ed36dbbd9c
mv std/ lib/
that's all this commit does. further commits will fix cli flags and
such.

see #2221
2019-09-25 23:35:41 -04:00

24 lines
629 B
Zig

const std = @import("../../std.zig");
const testing = std.testing;
const math = std.math;
const cmath = math.complex;
const Complex = cmath.Complex;
/// Returns the hyperbolic arc-tangent of z.
pub fn atanh(z: var) Complex(@typeOf(z.re)) {
const T = @typeOf(z.re);
const q = Complex(T).new(-z.im, z.re);
const r = cmath.atan(q);
return Complex(T).new(r.im, -r.re);
}
const epsilon = 0.0001;
test "complex.catanh" {
const a = Complex(f32).new(5, 3);
const c = atanh(a);
testing.expect(math.approxEq(f32, c.re, 0.146947, epsilon));
testing.expect(math.approxEq(f32, c.im, 1.480870, epsilon));
}