פרסומים אחרונים במדור "מדע"

>>perl -le 'print 0xffff_ffff % 6 '
3
>>perl -le 'print int 0xffff_ffff / 6 '
715827882

The book is a promising reference concept, but the execution is somewhat sloppy. Whatever algorithm they used was not fully tested. The bulk of each page seems random enough. However at the lower left and lower right of alternate pages, the number is found to increment directly

‏¹ http://www.nsastutter.org/aboutTheNSA/index.html

:-q

"be very , very suspicious of a system-supplied rand()"a

If all scientific papers whose results are in doubt because of bad rand()s were
to disappear from library shelves, there would be a gap on each shelf about as
big as your fist.

<?php
function frand($to=100, $from=0, $if_float=0, $if_abs=true, $if_trace=false) {
$to++;
$tracer = microtime();
list($micro, $sec) = explode(" ", $tracer);
$tracer = " - $tracer";
$FLOAT = ";
$MUL = 1;
if ($if_float > 0) {$to--; $FLOAT = '.'.frand(pow(10, $if_float));}
if ($if_trace === false) { $tracer = ";}
if ($if_abs === false) { $MUL = frand(2) == 0 ? -1 : 1; }
$micro = pow($micro, 2) + $micro +41; // according to Euler's formula
$sec = pow($sec, 2) + $sec +41;
$precisement = strlen($to) +substr($micro, 0, 2) +2;
$ret = sprintf("[%.{$precisement}f]",($micro/$sec));
return ((((substr($ret, (strlen($to) > 3 ? (5+strlen($to))*(-1) : -5)) % ($to-$from)) + $from).$FLOAT)*$MUL).$tracer;
}
?>

4de1 a457 d1ac f25c de18 22a3 6e41 69f0