zig/lib/std/math/complex/proj.zig
Andrew Kelley ed36dbbd9c
mv std/ lib/
that's all this commit does. further commits will fix cli flags and
such.

see #2221
2019-09-25 23:35:41 -04:00

26 lines
607 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 projection of z onto the riemann sphere.
pub fn proj(z: var) Complex(@typeOf(z.re)) {
const T = @typeOf(z.re);
if (math.isInf(z.re) or math.isInf(z.im)) {
return Complex(T).new(math.inf(T), math.copysign(T, 0, z.re));
}
return Complex(T).new(z.re, z.im);
}
const epsilon = 0.0001;
test "complex.cproj" {
const a = Complex(f32).new(5, 3);
const c = proj(a);
testing.expect(c.re == 5 and c.im == 3);
}