Merge branch 'master' into zen_stdlib

1 files changed, 21 insertions, 0 deletions

diff --git a/std/math/complex/acosh.zig b/std/math/complex/acosh.zig
new file mode 100644
index 0000000000..8dd91b2836
--- /dev/null
+++ b/std/math/complex/acosh.zig
@@ -0,0 +1,21 @@
+const std = @import("../../index.zig");
+const debug = std.debug;
+const math = std.math;
+const cmath = math.complex;
+const Complex = cmath.Complex;
+
+pub fn acosh(z: var) Complex(@typeOf(z.re)) {
+    const T = @typeOf(z.re);
+    const q = cmath.acos(z);
+    return Complex(T).new(-q.im, q.re);
+}
+
+const epsilon = 0.0001;
+
+test "complex.cacosh" {
+    const a = Complex(f32).new(5, 3);
+    const c = acosh(a);
+
+    debug.assert(math.approxEq(f32, c.re, 2.452914, epsilon));
+    debug.assert(math.approxEq(f32, c.im, 0.546975, epsilon));
+}