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From: Moebius <invalid@example.invalid>
Newsgroups: sci.math
Subject: Re: Division of two complex numbers
Date: Mon, 20 Jan 2025 23:48:45 +0100
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Am 20.01.2025 um 23:40 schrieb Chris M. Thomasson:

> [...] Fwiw, a fun part of GLSL is doing stuff like:
> 
> vec3 a = vec3(.25, 1, .75);
> vec2 b = a.xz;
> vec2 c = b + vec2(.75, .25);
> 
> c now equals (1, 1)

Nice.


In math:

a := (.25, 1, .75) ,

b := (a_1, a_3) ,

c := b + (.75, .25) .

Then c = (1, 1) .

:-P


Question. What if

vec4 a = vec4(.25, 1, .75, .999);

vec3 b = a.xz<?>;

I'd like to get b == (.25, .75, .999). :-P