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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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  <title>Building Statespace models (LTPDA Toolbox)</title>
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  <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Building Statespace models</h1>
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<H2>How to build a ssm object. 
</H2>
<UL>
	<LI><P><FONT COLOR="#000000">The empty constructor creates an empty
	statespace model</FONT></P>
	<DIV CLASS="fragment"><PRE><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>&gt;&gt; </FONT></FONT></FONT>s = ssm()</PRE></DIV>
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	<LI><P><FONT COLOR="#000000">Models can be built out of built-in
	models (mfiles stored in a folder), out of a description with a
	plist, from a repository or a xml file, but also out of a pzmodel, a
	rational or a miir model. Conversion out of a parFrac object is not
	implemented yet.</FONT></P>
	<DIV CLASS="fragment"><PRE><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>&gt;&gt; </FONT></FONT></FONT>s = ssm(&lt;pzmodel&gt;)<BR><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>&gt;&gt; </FONT></FONT></FONT>s = ssm(&lt;miir&gt;)<BR><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>&gt;&gt; </FONT></FONT></FONT>s = ssm(&lt;rational&gt;)</PRE></DIV>
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<UL>
	<LI><P><FONT COLOR="#000000">This creates a new statespace model by
	loading the object from disk, either out of an xml file or a .mat
	file. The latter is not recommended as Matlab data format poses some
	new retro-compatibility issues at each new release.</FONT></P>
	<DIV CLASS="fragment"><PRE><FONT SIZE=2><FONT FACE="Courier New, monospace"><FONT COLOR="#000000">&gt;&gt; s = ssm(</FONT><FONT COLOR="#a020f0">'a1.xml'</FONT><FONT COLOR="#000000">)<BR></FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>&gt;&gt; s = ssm(</FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'a1.mat'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>)</FONT></FONT></FONT></PRE></DIV>
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	<LI><P><FONT COLOR="#000000">For internal use (see built-in models),
	a structure constructor is available. This is constructor should not
	be used &ndash; except inside a built-in model &ndash; as it does
	not increment history, making it impossible to rebuild the object.</FONT></P>
	<DIV CLASS="fragment"><PRE><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>&gt;&gt; </FONT></FONT></FONT>s = ssm(&lt;struct&gt;)</PRE></DIV>
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<UL>
	<LI><P><FONT COLOR="#000000">There are dedicated help pages on how
	to build a model out of a built-in object or a plist description.</FONT></P>
	<DIV CLASS="fragment"><PRE><FONT COLOR="#000000">&gt;&gt; system = ssm(plist(<FONT COLOR="#a020f0">'built-in'</FONT>, <FONT COLOR="#a020f0">'&lt;model name&gt;'</FONT>))<BR></FONT><FONT COLOR="#000000">&gt;&gt; system = ssm(plist(</FONT><FONT COLOR="#a020f0">'built-in'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#000000">&lt;model number&gt;))</FONT>
&gt;&gt; system = ssm(plist(<FONT COLOR="#a020f0">'amats'</FONT>, &lt;a matrices&gt;  ... ))</PRE></DIV>
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      <td align="left" width="20"><a href="ssm_introduction.html"><img src=
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      "Introduction to Statespace Models with LTPDA"></a>&nbsp;</td>

      <td align="left">Introduction to Statespace Models with LTPDA</td>

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      <td align="right">Building from scratch</td>

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