Mathematica 7 compares to other languages

William James w_a_x_man at yahoo.com
Thu Dec 11 12:53:15 CET 2008


William James wrote:

> John W Kennedy wrote:
> 
> > Xah Lee wrote:
> > > In lisp, python, perl, etc, you'll have 10 or so lines. In C or
> > > Java, you'll have 50 or hundreds lines.
> > 
> 
> > Java:
> > 
> > static float[] normal(final float[] x) {
> >    float sum = 0.0f;
> >    for (int i = 0; i < x.length; ++i) sum += x[i] * x[i];
> >    final float divisor = (float) Math.sqrt(sum);
> >    float[] a = new float[x.length];
> >    for (int i = 0; i < x.length; ++i) a[i] = x[i]/divisor;
> >    return a;
> > }
> 
> "We don't need no stinkin' loops!"
> 
> SpiderMonkey Javascript:
> 
> function normal( ary )
> { div=Math.sqrt(ary.map(function(x) x*x).reduce(function(a,b) a+b))
>   return ary.map(function(x) x/div)
> }

The variable "div" shouldn't be global.

function normal( ary )
{ var div = Math.sqrt(
    ary.map(function(x) x*x).reduce(function(a,b) a+b) )
  return ary.map(function(x) x/div)
}




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