From ed36dbbd9c9dc21b2eebae1b31586fea1c6b51c3 Mon Sep 17 00:00:00 2001 From: Andrew Kelley Date: Wed, 25 Sep 2019 23:35:41 -0400 Subject: mv std/ lib/ that's all this commit does. further commits will fix cli flags and such. see #2221 --- lib/std/math/complex/atanh.zig | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 lib/std/math/complex/atanh.zig (limited to 'lib/std/math/complex/atanh.zig') diff --git a/lib/std/math/complex/atanh.zig b/lib/std/math/complex/atanh.zig new file mode 100644 index 0000000000..225e7c61de --- /dev/null +++ b/lib/std/math/complex/atanh.zig @@ -0,0 +1,23 @@ +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)); +} -- cgit v1.2.3