Statistic 函数
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stats_dens_normal

(PECL stats >= 1.0.0)

stats_dens_normal — Not documented

说明

float stats_dens_normal ( float $x , float $ave , float $stdev )
Warning

本函数还未编写文档，仅有参数列表。

参数

x

ave

stdev

返回值

Statistic 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Not documented

用户评论:

Anonymous (11-Aug-2009 12:12)

There's a way to try it out:

<?php
...
echo"<pre>\n";
for($x=-2;$x<=2;$x+=0.1){
  echo"$i; ".stats_dens_normal($x,1,1)."\n";
}
echo"</pre>\n";
?>

Observe the result (to determine yourself), or
save it as "stats_dens_normal.csv",
load it into Open Office and make a graph of it

Anonymous (28-Feb-2009 10:37)

I'm not certain that I've figured this one out correctly but it should return the value of a (Gaussian) normal distribution of the given properties at the given location.
$x - the X-Value to request
$ave - the 'expected value' (i.e. location of the peak) for the distribution. For most uses this will just be 0.
$stdev - the standard deviation of the distribution. For most uses this will be 1.