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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from zerocrossing.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="zerocrossing" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:scilab="http://www.scilab.org"
xmlns:db="http://docbook.org/ns/docbook">
<refnamediv>
<refname>zerocrossing</refname>
<refpurpose>This function estimates the points at which a given waveform y=y(x) crosses the x-axis using linear interpolation. </refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
w = zerocrossing (x, y)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>w:</term>
<listitem><para>vector of points at which the function y(x) crosses x-axis. </para></listitem></varlistentry>
<varlistentry><term>y:</term>
<listitem><para> The dependant variable,y(x)</para></listitem></varlistentry>
<varlistentry><term>x:</term>
<listitem><para> The independant variable</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This function estimates the points at which a given waveform y = y(x) crosses the x-axis. It uses linear interpolation.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
x = linspace(0,1,100);
y = 2*sin(2*%pi*x);
x0= zerocrossing(x,y);
//ans:
// x0 = 0. 0.5 1.0 1.5
y0=interp1(x,y,x0)
plot(x,y,x0,y0,'x')
]]></programlisting>
<scilab:image>
x = linspace(0,2,200);
y = 2*sin(2*%pi*x);
x0= zerocrossing(x,y);
y0=interp1(x,y,x0)
plot(x,y,x0,y0,'x')
</scilab:image>
</refsection>
</refentry>
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