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| Title : |
A function that generates random numbers between 0 and 1 with precision that you set
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| Categories : |
PHP, Math. |
Boaz Yahav |
| Date : |
May 03rd 2003 |
| Grade : |
4 of 5 (graded 7 times) |
| Viewed : |
7081 |
| File : |
No file for this code example. |
| Images : |
No Images for this code example. |
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| Search : |
More code by Boaz Yahav |
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| Action : |
Grade This Code Example
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| Tools : |
My Examples List |
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<?
function GetSmallRandomNumber($precision) {
$r = rand(0,pow(10,$precision))/pow(10,$precision);
return $r;
}
?>
Example 1
=========
<?
GetSmallRandomNumber(0);
?>
will return 0 or 1
Example 2
=========
<?
GetSmallRandomNumber(1);
?>
will return numbers like 0.3 or 0.8 etc...
Example 3
=========
<?
GetSmallRandomNumber(4);
?>
will return numbers like 0.4507 or 0.8501 etc... |
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| | | | | P C wrote : 1093
I give this example a good grade for the following reasons:
1. The code does exactly what it says in the title, so it won`t waste your time if you`re not interested.
2. It is simple and accurate coding. The purists among us may criticize that the repetition of the power function may be avoided.
3. It is complete with examples.
For those who tend to think that the code is trivial, please remember that the purpose of the code examples library caters for everyone, beginners to gurus alike. Perhaps the forum could insert an attribute related to the level of difficulty to codes submitted. This way, everyone will benefit more from the code examples.
| | | | Chao Xu wrote :1680
You can just use lcg_value() and then take out the ending numbers you don`t need.
It does not work on large precision, like 1000th decimal. a BCMath version could be better(I`m making it :))
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