Re: Help: Get the value of pi up to 200+ digits? -- oops

Oops...I didn't see the earlier message that BC functions were not enabled on your server. So, I'd have to concur with Oliver Grätz's suggestions, and add some of my own:

        - can you change hosts?
        - are you allowed to install software in your own directory? You may be able to compile & install your own version of PHP and call it via CGI.

        steve, again.

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@hymiegladstone.com> wrote:534D8D52-751D-45B6-9B49-DD9FA136C727@hymiegladstone.com... 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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| Steve Edberg                                      sbedberg@ucdavis.edu |
| Database/Programming/SysAdmin                            (530)754-9127 |
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