doc-en/reference/stats/functions/stats-cdf-weibull.xml at master · php/doc-en · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.stats-cdf-weibull" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>stats_cdf_weibull</refname>
  <refpurpose>Calculates any one parameter of the Weibull distribution given values for the others</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>float</type><methodname>stats_cdf_weibull</methodname>
   <methodparam><type>float</type><parameter>par1</parameter></methodparam>
   <methodparam><type>float</type><parameter>par2</parameter></methodparam>
   <methodparam><type>float</type><parameter>par3</parameter></methodparam>
   <methodparam><type>int</type><parameter>which</parameter></methodparam>
  </methodsynopsis>
  <simpara>
   Returns the cumulative distribution function, its inverse, or one of its parameters,
   of the Weibull distribution. The kind of the return value and parameters
   (<parameter>par1</parameter>, <parameter>par2</parameter>, and <parameter>par3</parameter>)
   are determined by <parameter>which</parameter>.
  </simpara>
  <para>
   The following table lists the return value and parameters by <parameter>which</parameter>.
   CDF, x, k, and lambda denotes cumulative distribution function, the value of the random variable,
   the shape and the scale parameter of the Weibull distribution, respectively.
   <table>
    <title>Return value and parameters</title>
    <tgroup cols="5">
     <thead>
      <row>
       <entry><parameter>which</parameter></entry>
       <entry>Return value</entry>
       <entry><parameter>par1</parameter></entry>
       <entry><parameter>par2</parameter></entry>
       <entry><parameter>par3</parameter></entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>1</entry>
       <entry>CDF</entry>
       <entry>x</entry>
       <entry>k</entry>
       <entry>lambda</entry>
      </row>
      <row>
       <entry>2</entry>
       <entry>x</entry>
       <entry>CDF</entry>
       <entry>k</entry>
       <entry>lambda</entry>
      </row>
      <row>
       <entry>3</entry>
       <entry>k</entry>
       <entry>x</entry>
       <entry>CDF</entry>
       <entry>lambda</entry>
      </row>
      <row>
       <entry>4</entry>
       <entry>lambda</entry>
       <entry>x</entry>
       <entry>CDF</entry>
       <entry>k</entry>
      </row>
     </tbody>
    </tgroup>
   </table>
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>par1</parameter></term>
     <listitem>
      <simpara>
       The first parameter
      </simpara>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>par2</parameter></term>
     <listitem>
      <simpara>
       The second parameter
      </simpara>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>par3</parameter></term>
     <listitem>
      <simpara>
       The third parameter
      </simpara>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>which</parameter></term>
     <listitem>
      <simpara>
       The flag to determine what to be calculated
      </simpara>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <simpara>
   Returns CDF, x, k, or lambda, determined by <parameter>which</parameter>.
  </simpara>
 </refsect1>

</refentry>

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