On Dec 10, 3:37 pm, [EMAIL PROTECTED] wrote:
> On Dec 5, 9:51 am, Xah Lee <[EMAIL PROTECTED]> wrote:
>
>
>
> > For those of you who don't know linear algebra but knows coding, this
> > means, we want a function whose input is a list of 3 elements say
> > {x,y,z}, and output is also a list of 3 elements, say {a,b,c}, with
> > the condition that
>
> > a = x/Sqrt[x^2+y^2+z^2]
> > b = y/Sqrt[x^2+y^2+z^2]
> > c = z/Sqrt[x^2+y^2+z^2]
>
> > In lisp, python, perl, etc, you'll have 10 or so lines. In C or Java,
> > you'll have 50 or hundreds lines.
void normalise(float d[], float v[]){
float m = sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2]);
d[0] = v[0]/m; // My guess is Xah Lee
d[1] = v[1]/m; // hasn't touched C
d[2] = v[2]/m; // for near to an eternitee
}
>
> Ruby:
>
> def norm a
> s = Math.sqrt(a.map{|x|x*x}.inject{|x,y|x+y})
> a.map{|x| x/s}
> end
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