25 lines
609 B
Zig
25 lines
609 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 natural logarithm of z.
|
|
pub fn log(z: var) Complex(@typeOf(z.re)) {
|
|
const T = @typeOf(z.re);
|
|
const r = cmath.abs(z);
|
|
const phi = cmath.arg(z);
|
|
|
|
return Complex(T).new(math.ln(r), phi);
|
|
}
|
|
|
|
const epsilon = 0.0001;
|
|
|
|
test "complex.clog" {
|
|
const a = Complex(f32).new(5, 3);
|
|
const c = log(a);
|
|
|
|
testing.expect(math.approxEq(f32, c.re, 1.763180, epsilon));
|
|
testing.expect(math.approxEq(f32, c.im, 0.540419, epsilon));
|
|
}
|