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