On 11 October 2011 18:29, Mike Day <[email protected]> wrote:
> ...............
> Run
> x: +/ sumq >: i. 12000 NB. very nearly a spoiler
Mike,
I haven't read your solution in detail, but was curious to try it, and got
the following:
x: +/ sumq >: i. 12000
|domain error: sumq
| x:+/ sumq>:i.12000
On ......... I wrote:
> f 12000
> .................
> ...... very slow for 12000: almost 2 min on my computer.
I implemented the same algorithm on several other interpreted
languages and ran it on the same machine as my J solution.
All were significantly faster than J at 12000:
Rebol – 19s,
CLisp – 16s,
PostScript – 9s,
Lua, Python – 6.5s,
Ruby – 3s,
Scheme (Racket) – less than 0.5s!
J is often amazingly fast at whole-array (non-iterative) operations,
but seems to be rather unfavourable to iterative (including recursive)
ones.
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
