const std = @import("../../std.zig");
const testing = std.testing;
const math = std.math;
const cmath = math.complex;
const Complex = cmath.Complex;
pub fn log(z: anytype) Complex(@TypeOf(z.re)) {
const T = @TypeOf(z.re);
const r = cmath.abs(z);
const phi = cmath.arg(z);
return Complex(T).init(@log(r), phi);
}
const epsilon = 0.0001;
test "complex.clog" {
const a = Complex(f32).init(5, 3);
const c = log(a);
try testing.expect(math.approxEqAbs(f32, c.re, 1.763180, epsilon));
try testing.expect(math.approxEqAbs(f32, c.im, 0.540419, epsilon));
}