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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_power">
<refmeta>
<refentrytitle>power</refentrytitle>
<refmiscinfo>number</refmiscinfo>
</refmeta>
<refnamediv>
<refname>power</refname>
<refpurpose>return value of expression raised to specified
power.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_power">
<funcprototype id="fproto_power">
<funcdef><function>power</function></funcdef>
<paramdef>in <parameter>x</parameter> double precision</paramdef>
<paramdef>in <parameter>y</parameter> double precision</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_power"><title>Description</title>
<para><function>power</function> raises x to the yth power and returns
the value as a IEEE 64-bit float.</para>
</refsect1>
<refsect1 id="params_power"><title>Parameters</title>
<refsect2><title>x</title>
<para><type>double precision</type></para>
</refsect2>
<refsect2><title>y</title>
<para><type>double precision</type></para>
</refsect2>
</refsect1>
<refsect1 id="ret_power"><title>Return Values</title>
<para><function>power</function> returns a IEEE 64-bit float.</para>
</refsect1>
<refsect1 id="examples_power"><title>Examples</title>
<example id="ex_power"><title>Stored Procedure Example</title>
<para>Calculate squares of integers between 2 numbers.</para>
<screen>
SQL> create procedure
calc_pow2s (in _from integer, in _to integer)
{
declare i integer;
declare result double precision;
result_names (i, result);
i := _from;
while (i < _to)
{
result (i, power (i, 2));
i := i + 1;
}
}
;
Done. -- 5 msec.
SQL> calc_pow2s (1, 10);
i result
INTEGER NOT NULL DOUBLE PRECISION NOT NULL
_______________________________________________________________________________
1 1.000000
2 4.000000
3 9.000000
4 16.000000
5 25.000000
6 36.000000
7 49.000000
8 64.000000
9 81.000000
9 Rows. -- 7 msec.
</screen>
</example>
</refsect1>
<refsect1 id="seealso_power"><title>See Also</title>
<para><link linkend="fn_log"><function>log</function></link></para>
</refsect1>
</refentry>
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