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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from pchip.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="pchip" 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>pchip</refname>
<refpurpose>This function returns piecewise cubic hermite interpolating polynomial.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
d=pchip(x,y)
d= pchip(x,y,xx)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>x:</term>
<listitem><para> points at which the function is defined</para></listitem></varlistentry>
</variablelist>
<variablelist>
<varlistentry><term>y:</term>
<listitem><para> function of variable x</para><para>Note that the lengths of x and y should be the same.</para></listitem></varlistentry>
</variablelist>
<variablelist>
<varlistentry><term>xx:</term>
<listitem><para> points of interpolation</para></listitem></varlistentry>
</variablelist>
<variablelist>
<varlistentry><term>d:</term>
<listitem><para> vector of interpolantant at xx
</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
x=[0 1 2 3 4 5]
y=[1 0 1 0 1 0]
xx=linspace(0,5,800)
v=pchip(x, y)
v=pchip(x,y,xx)
plot(x,y,xx,v,'o')
]]></programlisting>
<scilab:image>
x=[0 1 2 3 4 5]
y=[1 0 1 0 1 0]
xx=linspace(0,5,800)
v=pchip(x, y)
v=pchip(x,y,xx)
plot(x,y,xx,v,'o')
</scilab:image>
</refsection>
</refentry>
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