Re: time function inside loop

On Sun, Dec 6, 2015 at 1:16 AM Karim Belabas <Karim.Belabas@math.u-bordeaux.fr> wrote:

* Richard Robinson [2015-12-06 07:54]:
>
> This is a really simple question.
>
> Is it possible to get the time function to work inside of a loop?
>
> I can get it to work outside of one but I just get various syntax errors
> when I try it inside.
>
> for (i=6,887, \
> tot= 23 * 76 * 76 * 654 * 6543 + i; \
> #
> );
> #
> quit

Use the gettime() function :

{
gettime(); /* reset timer */
for (i=6,887,
tot= 23 * 76 * 76 * 654 * 6543 + i;
print(gettime());
);
quit
}

(the enclosing braces are only here to avoid the trailing \ after each line)

N.B. 1) '#' is a "shortcut" that switches the timer on and off and only
works as a single statement in the gp interpreter (like \r and friends
mentionned in ?\): it cannot be combined with other statements.

2) The "time" function is gettime(), that returns the number of
miliseconds since the last call to itself.

3) If you really want the effect of '#' itself (switch timer on and off)
and not the elapsed time, the corresponding command would be
default(timer, 1) \\ switch timer on; replace 1 -> 0, to switch it off

Cheers,

K.B.
--
Karim Belabas, IMB (UMR 5251) Tel: (+33) (0)5 40 00 26 17
Universite de Bordeaux Fax: (+33) (0)5 40 00 69 50
351, cours de la Liberation http://www.math.u-bordeaux.fr/~kbelabas/
F-33405 Talence (France) http://pari.math.u-bordeaux.fr/ [PARI/GP]
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