zig/std/math/complex/acos.zig

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Zig

const std = @import("../../index.zig");
const debug = std.debug;
const math = std.math;
const cmath = math.complex;
const Complex = cmath.Complex;
pub fn acos(z: var) Complex(@typeOf(z.re)) {
const T = @typeOf(z.re);
const q = cmath.asin(z);
return Complex(T).new(T(math.pi) / 2 - q.re, -q.im);
}
const epsilon = 0.0001;
test "complex.cacos" {
const a = Complex(f32).new(5, 3);
const c = acos(a);
debug.assert(math.approxEq(f32, c.re, 0.546975, epsilon));
debug.assert(math.approxEq(f32, c.im, -2.452914, epsilon));
}