Xah Lee wrote:
On Dec 10, 2:47 pm, John W Kennedy <[EMAIL PROTECTED]> 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.
[...]
Thanks to various replies.
I've now gather code solutions in ruby, python, C, Java, here:
• A Example of Mathematica's Expressiveness
http://xahlee.org/UnixResource_dir/writ/Mathematica_expressiveness.html
now lacking is perl, elisp, which i can do well in a condensed way.
It'd be interesting also to have javascript...
mmm, stone soup...
javascript:
var map = function(fn, a) {
var b = new Array(a.length);
for (i = 0; i < a.length; i++) {
b[i] = fn(a[i]);
}
return b
};
var reduce = function(fn, a, init) {
var s = init;
for (i = 0; i < a.length; i++) {
s = fn(s, a[i]);
}
return s
};
var sum = function(a) {
return reduce(function(x, y) { return x + y }, a, 0.0)
};
var norm = function(a) {
var pow = Math.pow;
return Math.sqrt(sum(map(function(x) { return pow(x, 2) }, a)))
};
var Unit = function(a) {
var N = norm(a);
return map(function(x) { return x/N }, a)
};
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