power (XForms function)

Abstract

Calculates the value of xn, where you supply x and n.

Syntax

   power(xvalue, nvalue)

Table 1. power parameter

Parameter	Type	Description
xvalue	number	The base number. This is raised to the power of n.
nvalue	number	The exponent. This is applied the x value.

Returns

A number representing the result, or NaN if the result is not a real number.

Example

The following model uses the power function to apply the Pythagorean theorem to the sides of a triangle. The user enters sides a and b into fields that are linked to the <a> and <b> data elements. Side c is then calculated by the xforms:bind, which uses the power function to get the square root of a2 + b2 . This value is then stored in the <c> data element.

   <xforms:model>

      <xforms:instance xmlns="">

         <root>

            <a/>

            <b/>

            <c/>

         </root>

      </xforms:instance>

      <xforms:bind nodeset="c"

         calculate="power(../a * ../a + ../b * ../b, 0.5)"/>

   </xforms:model>

Parent topic:
XForms utility functions

Article information

Category:

Extensible Forms Description Language XFDL 8.0, Product Documentation,

Tags:

power function, utility functions, XForms functions, power, exponent, XFDL, 8.0, spec

This Version:

Version 1

May 2, 2012

2:28:17 PM

by IBM

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