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std.math.complex: Add squared magnitude function (#21998)

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Chris Boesch 2024-11-26 14:03:48 +01:00 • committed by GitHub
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commit 87863a834b
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lib/std/math/complex.zig
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@ -115,6 +115,10 @@ pub fn Complex(comptime T: type) type {
pub fn magnitude(self: Self) T { pub fn magnitude(self: Self) T {
return @sqrt(self.re * self.re + self.im * self.im); return @sqrt(self.re * self.re + self.im * self.im);
} }
pub fn squaredMagnitude(self: Self) T {
return self.re * self.re + self.im * self.im;
}
}; };
} }
@ -189,6 +193,13 @@ test "magnitude" {
try testing.expect(math.approxEqAbs(f32, c, 5.83095, epsilon)); try testing.expect(math.approxEqAbs(f32, c, 5.83095, epsilon));
} }
test "squaredMagnitude" {
const a = Complex(f32).init(5, 3);
const c = a.squaredMagnitude();
try testing.expect(math.approxEqAbs(f32, c, math.pow(f32, a.magnitude(), 2), epsilon));
}
test { test {
_ = @import("complex/abs.zig"); _ = @import("complex/abs.zig");
_ = @import("complex/acosh.zig"); _ = @import("complex/acosh.zig");