Hi -
The 'precision' ini value refers, I believe, only to float numbers, not
BC_math numbers (which are stored as strings). I believe the bcmath.scale
parameter is the one you need. It can be set via ini_set or bcscale() -
http://php.he.net/manual/en/function.bcscale.php
Perhaps you could tell us *why* you need pi to 200 digits. If it's just for
display, I'd simply define it as a string somewhere in your program:
define('PI_LOOOOOONNNG', '3.1415927...........8468');
However, I would guess that doing math using the BC functions at that
precision would be extremely slow. Going to a dedicated math package like
MATLAB or Mathematica or something might be more appropriate.
steve
At 08:57 AM 9/1/2005, Wong HoWang wrote:
Dear Jordan,
I know what you mean. But you may try this one and you will know:
<?php
ini_set('precision',200);
echo pi();
?>
the result is the same as 16!!!
So that's why I ask this question! I am not stupid like that!
Please help, thx!
"Jordan Miller" <jmil@xxxxxxxxxxxxxxxxxx>
wrote:534D8D52-751D-45B6-9B49-DD9FA136C727@xxxxxxxxxxxxxxxxxxxxx
> http://us3.php.net/manual/en/ini.core.php#ini.precision
>
> precision sets the number of significant digits, *NOT* the number of
> digits displayed after the decimal point.
>
> If you want to get pi out to 16 decimal places you need a precision of
> *17* because the beginning 3 is a significant digit.
>
> Your code does exactly this, displaying pi with 15 decimal places.
>
> Jordan
>
>
>
> On Sep 1, 2005, at 8:06 AM, Wong HoWang wrote:
>
>> Dear all,
>>
>> I'm trying to do like this but failed:
>>
>> <?php
>> ini_set('precision',16);
>> echo pi();
>> ?>
>>
>> How can I get more digits after . ?
>>
>> Can anyone help? Thx!
>>
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| Database/Programming/SysAdmin (530)754-9127 |
| UC Davis Genome Center http://pgfsun.ucdavis.edu/ |
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