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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+   "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
+
+<html lang="en">
+<head>
+  <meta name="generator" content=
+  "HTML Tidy for Mac OS X (vers 1st December 2004), see www.w3.org">
+  <meta http-equiv="Content-Type" content=
+  "text/html; charset=us-ascii">
+
+  <title>Building from scratch (LTPDA Toolbox)</title>
+  <link rel="stylesheet" href="docstyle.css" type="text/css">
+  <meta name="generator" content="DocBook XSL Stylesheets V1.52.2">
+  <meta name="description" content=
+  "Presents an overview of the features, system requirements, and starting the toolbox.">
+  </head>
+
+<body>
+  <a name="top_of_page" id="top_of_page"></a>
+
+  <p style="font-size:1px;">&nbsp;</p>
+
+  <table class="nav" summary="Navigation aid" border="0" width=
+  "100%" cellpadding="0" cellspacing="0">
+    <tr>
+      <td valign="baseline"><b>LTPDA Toolbox</b></td><td><a href="../helptoc.html">contents</a></td>
+
+      <td valign="baseline" align="right"><a href=
+      "ssm_building.html"><img src="b_prev.gif" border="0" align=
+      "bottom" alt="Building Statespace models"></a>&nbsp;&nbsp;&nbsp;<a href=
+      "ssm_build_built_in.html"><img src="b_next.gif" border="0" align=
+      "bottom" alt="Building from built-in models"></a></td>
+    </tr>
+  </table>
+
+  <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Building from scratch</h1>
+  <hr>
+  
+  <p>
+	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<HTML>
+<HEAD>
+	<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=windows-1252">
+	<TITLE></TITLE>
+	<META NAME="GENERATOR" CONTENT="OpenOffice.org 3.1  (Win32)">
+	<META NAME="CREATED" CONTENT="0;0">
+	<META NAME="CHANGEDBY" CONTENT="Adrien G">
+	<META NAME="CHANGED" CONTENT="20090827;17511500">
+</HEAD>
+<BODY LANG="en-US" DIR="LTR">
+<P>The models can be built from a plist constructor describing each
+field. It is possible to give incomplete information on the model and
+let the constructor auto-complete some fields.</P>
+<P>It is still rather lengthy to build a ssm object, and it is
+advisable to write built-in models to limit the time spent on
+modeling.</P>
+<H2>Incomplete description without parameters (params field) and
+input/state/outputs names</H2>
+<P>The most retrained set of inputs is 
+</P>
+<DIV CLASS="fragment"><PRE STYLE="margin-bottom: 0.5cm">sys = ssm(plist( 'amats',amats, 'bmats',bmats, 'cmats',cmats, 'dmats',dmats, 'timestep',timestep, 'name',name  )</PRE></DIV><P>
+Then a shortcut for the scripts is (note that the input order must be
+respected)</P>
+<DIV CLASS="fragment"><PRE STYLE="margin-bottom: 0.5cm">sys = ssm( amats, bmats, cmats, dmats, timestep, name )</PRE></DIV><P>
+example :</P>
+<DIV CLASS="fragment"><PRE><FONT COLOR="#000000">&gt;&gt; name = </FONT><FONT COLOR="#a020f0">'sys'</FONT><FONT COLOR="#000000">;</FONT>
+&gt;&gt; timestep = 0;
+&gt;&gt; amats = cell(3,3);
+&gt;&gt; bmats = cell(3,3);
+&gt;&gt; cmats = cell(3,3);
+&gt;&gt; dmats = cell(3,3);
+<FONT COLOR="#000000">&gt;&gt; amats{1,1} = -(sym(</FONT><FONT COLOR="#a020f0">'OMEGA'</FONT><FONT COLOR="#000000">));</FONT>
+&gt;&gt; amats{2,2} = -2;
+&gt;&gt; amats{3,3} = [0 1 ; -0.05 -0.01];
+&gt;&gt; amats{3,1} = [-1;-3];
+&gt;&gt; bmats{1,1} = 1;
+&gt;&gt; bmats{2,2} = 2;
+&gt;&gt; bmats{3,3} = 3*eye(2);
+&gt;&gt; cmats{1,1} = 1;
+&gt;&gt; cmats{2,2} = 1;
+&gt;&gt; cmats{3,3} = eye(2);
+&gt;&gt; dmats{1,3} = [6 6];
+&gt;&gt; dmats{2,1} = 6;
+&gt;&gt; dmats{3,2} = [6;6];
+<FONT COLOR="#000000">&gt;&gt; sys = ssm(plist( </FONT><FONT COLOR="#0000ff">...</FONT>
+<FONT SIZE=2>'amats'</FONT><FONT COLOR="#000000">,amats, </FONT>'bmats'<FONT COLOR="#000000">,bmats, </FONT>'cmats'<FONT COLOR="#000000">,cmats, </FONT>'dmats'<FONT COLOR="#000000">,dmats, </FONT><FONT COLOR="#0000ff">...</FONT>
+<FONT SIZE=2>'timestep'</FONT><FONT COLOR="#000000">,timestep, </FONT>'name'<FONT COLOR="#000000">,name))</FONT>
+------ ssm/1 -------
+      amats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                [2x1]    []     [2x2]  }  [3x3]
+      mmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      bmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      cmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      dmats: {   []      []     [1x2]   
+                [1x1]    []      []     
+                 []     [2x1]    []    }  [3x3]
+   timestep: 0
+     inputs:  [1x3 ssmblock]
+         1 : input 1 | input 1 &gt; 1 []
+         2 : input 2 | input 2 &gt; 1 []
+         3 : input 3 | input 3 &gt; 1 [], input 3 &gt; 2 []
+     states:  [1x3 ssmblock]
+         1 : state 1 | state 1 &gt; 1 []
+         2 : state 2 | state 2 &gt; 1 []
+         3 : state 3 | state 3 &gt; 1 [], state 3 &gt; 2 []
+    outputs:  [1x3 ssmblock]
+         1 : output 1 | output 1 &gt; 1 []
+         2 : output 2 | output 2 &gt; 1 []
+         3 : output 3 | output 3 &gt; 1 [], output 3 &gt; 2 []
+     params: (empty-plist) [1x1 plist]
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+    Ninputs: 3
+ inputsizes: [1 1 2]
+   Noutputs: 3
+outputsizes: [1 1 2]
+    Nstates: 3
+ statesizes: [1 1 2]
+    Nparams: 0
+isnumerical: false
+       hist: ssm.hist [1x1 history]
+   procinfo: (empty-plist) [1x1 plist]
+   plotinfo: (empty-plist) [1x1 plist]
+       name: sys
+description: 
+    mdlfile: 
+       UUID: 61f33fcc-f06a-4d71-944f-3ea094c80458
+--------------------</PRE></DIV><P>
+Then the field &ldquo;params&rdquo; must be user set using the syntax
+&ldquo;sys.setParams(&lt;parameter plist&gt;)&rdquo;. Otherwise the
+toolbox will simply assume there are no parameters in the system and
+the matrices should be exclusively numerical in this case..</P>
+<P>The content of &bdquo;params&ldquo; is a plist with parameters
+whose:</P>
+<UL>
+	<LI><P>KEY is the name of the parameter in the matrices</P>
+	<LI><P>VALUE is a property which must be set before proceeding
+	numerical substitutions</P>
+	<LI><P>MIN, MAX, and SIGMA which are useful for an optimizer if
+	system identification is proceeded.</P>
+</UL>
+<DIV CLASS="fragment"><PRE><FONT SIZE=2><FONT FACE="Courier New, monospace"><FONT COLOR="#000000">&gt;&gt;sys.setParams(plist({</FONT><FONT COLOR="#a020f0">'OMEGA'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'system frequency'</FONT><FONT COLOR="#000000">}, 2))</FONT></FONT></FONT>
+------ ssm/1 -------
+      amats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                [2x1]    []     [2x2]  }  [3x3]
+      mmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      bmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      cmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      dmats: {   []      []     [1x2]   
+                [1x1]    []      []     
+                 []     [2x1]    []    }  [3x3]
+   timestep: 0
+     inputs:  [1x3 ssmblock]
+         1 : input 1 | input 1 &gt; 1 []
+         2 : input 2 | input 2 &gt; 1 []
+         3 : input 3 | input 3 &gt; 1 [], input 3 &gt; 2 []
+     states:  [1x3 ssmblock]
+         1 : state 1 | state 1 &gt; 1 []
+         2 : state 2 | state 2 &gt; 1 []
+         3 : state 3 | state 3 &gt; 1 [], state 3 &gt; 2 []
+    outputs:  [1x3 ssmblock]
+         1 : output 1 | output 1 &gt; 1 []
+         2 : output 2 | output 2 &gt; 1 []
+         3 : output 3 | output 3 &gt; 1 [], output 3 &gt; 2 []
+     params: (OMEGA=2) [1x1 plist]
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+    Ninputs: 3
+ inputsizes: [1 1 2]
+   Noutputs: 3
+outputsizes: [1 1 2]
+    Nstates: 3
+ statesizes: [1 1 2]
+    Nparams: 1
+isnumerical: false
+       hist: ssm.hist [1x1 history]
+   procinfo: (empty-plist) [1x1 plist]
+   plotinfo: (empty-plist) [1x1 plist]
+       name: sys
+description: 
+    mdlfile: 
+       UUID: 7bccc440-fcc3-4d71-bf9c-057bbc08d318
+--------------------</PRE></DIV><P>
+The method &ldquo;setParams&rdquo; should not be confused with
+&ldquo;setParameters&rdquo; which only allows to modify the property
+VALUE in the &ldquo;params&rdquo; field.</P>
+<P>Input blocks and input variables will be automatically maned after
+their index number in this case, and the description field will be
+empty. 
+</P>
+<H2>Incomplete description whithout input/state/outputs names</H2>
+<P>In case the user has a plist describing the parameters, he may use
+the following either of the syntaxes:</P>
+<DIV CLASS="fragment"><PRE><FONT FACE="Courier New, monospace"><FONT SIZE=2><FONT COLOR="#000000">&gt;&gt; sys = ssm(plist( </FONT><FONT COLOR="#a020f0">'amats'</FONT><FONT COLOR="#000000">,amats, </FONT><FONT COLOR="#a020f0">'bmats'</FONT><FONT COLOR="#000000">,bmats, </FONT><FONT COLOR="#a020f0">'cmats'</FONT><FONT COLOR="#000000">,cmats, </FONT><FONT COLOR="#a020f0">'dmats'</FONT><FONT COLOR="#000000">,dmats, </FONT><FONT COLOR="#a020f0">'timestep'</FONT><FONT COLOR="#000000">,timestep, </FONT><FONT COLOR="#a020f0">'name'</FONT><FONT COLOR="#000000">,name, </FONT><FONT COLOR="#a020f0">'params'</FONT><FONT COLOR="#000000">,params ));</FONT></FONT></FONT>
+&gt;&gt; sys = ssm( amats, bmats, cmats, dmats, timestep, name, params )
+
+<FONT COLOR="#000000">&gt;&gt; name = </FONT><FONT COLOR="#a020f0">'sys'</FONT><FONT COLOR="#000000">;</FONT>
+&gt;&gt; timestep = 0;
+<FONT COLOR="#000000">&gt;&gt; params = plist({</FONT><FONT COLOR="#a020f0">'OMEGA'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'system frequency'</FONT><FONT COLOR="#000000">}, 2);</FONT>
+&gt;&gt; amats = cell(3,3);
+&gt;&gt; bmats = cell(3,3);
+&gt;&gt; cmats = cell(3,3);
+&gt;&gt; dmats = cell(3,3);
+<FONT COLOR="#000000">&gt;&gt; amats{1,1} = -(sym(</FONT><FONT COLOR="#a020f0">'OMEGA'</FONT><FONT COLOR="#000000">));</FONT>
+&gt;&gt; amats{2,2} = -2;
+&gt;&gt; amats{3,3} = [0 1 ; -0.05 -0.01];
+&gt;&gt; amats{3,1} = [-1;-3];
+&gt;&gt; bmats{1,1} = 1;
+&gt;&gt; bmats{2,2} = 2;
+&gt;&gt; bmats{3,3} = 3*eye(2);
+&gt;&gt; cmats{1,1} = 1;
+&gt;&gt; cmats{2,2} = 1;
+&gt;&gt; cmats{3,3} = eye(2);
+&gt;&gt; dmats{1,3} = [6 6];
+&gt;&gt; dmats{2,1} = 6;
+&gt;&gt; dmats{3,2} = [6;6];
+<FONT COLOR="#000000">&gt;&gt; sys = ssm(plist( </FONT><FONT COLOR="#0000ff">...</FONT>
+<FONT COLOR="#a020f0">'amats'</FONT><FONT COLOR="#000000">,amats, </FONT><FONT COLOR="#a020f0">'bmats'</FONT><FONT COLOR="#000000">,bmats, </FONT><FONT COLOR="#a020f0">'cmats'</FONT><FONT COLOR="#000000">,cmats, </FONT><FONT COLOR="#a020f0">'dmats'</FONT><FONT COLOR="#000000">,dmats, </FONT><FONT COLOR="#0000ff">...</FONT>
+<FONT COLOR="#a020f0">'timestep'</FONT><FONT COLOR="#000000">,timestep, </FONT><FONT COLOR="#a020f0">'name'</FONT><FONT COLOR="#000000">,name, </FONT><FONT COLOR="#a020f0">'params'</FONT><FONT COLOR="#000000">,params ));</FONT></PRE></DIV><P>
+Then the inputs, states and outputs name fields are still
+automatically set. 
+</P>
+<P>They can be modified by using the &ldquo;setBlock*&rdquo; and
+&ldquo;setPort*&rdquo; setter methods. Blocks are vectors of ports
+which will be matched when assembling two system. Setting their name
+correctly is important as the names are used to identify
+automatically which output will be fed to which input. Ports are
+independent variables and have properties like the name, the
+description and the unit which the user may want to set to keep track
+of the systems data. Note that there is no unit check implemented
+when assembling two systems.</P>
+<P>The setter functions are respectively &ldquo;setBlockNames&rdquo;,
+&ldquo;setBlockDescription&rdquo;, &ldquo;setPortNames&rdquo;,
+&ldquo;setPortDescriptions&rdquo;, &ldquo;setPortUnits&rdquo;.</P>
+<DIV CLASS="fragment"><PRE><FONT COLOR="#000000">&gt;&gt; sys.setBlockNames(plist(</FONT><FONT COLOR="#a020f0">'field'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'inputs'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'blocks'</FONT><FONT COLOR="#000000">, [1 2 3], </FONT><FONT COLOR="#a020f0">'names'</FONT><FONT COLOR="#000000">, {</FONT><FONT COLOR="#a020f0">'myinput1'</FONT><FONT COLOR="#000000">,</FONT><FONT COLOR="#a020f0">'myinput2'</FONT><FONT COLOR="#000000">,</FONT><FONT COLOR="#a020f0">'myinput3'</FONT><FONT COLOR="#000000">} ));</FONT>
+<FONT COLOR="#000000">&gt;&gt; sys.setBlockDescriptions(plist(</FONT><FONT COLOR="#a020f0">'field'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'inputs'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'blocks'</FONT><FONT COLOR="#000000">, {</FONT><FONT COLOR="#a020f0">'myinput1'</FONT><FONT COLOR="#000000">}, </FONT><FONT COLOR="#a020f0">'descriptions'</FONT><FONT COLOR="#000000">,{</FONT><FONT COLOR="#a020f0">'myinput1 description'</FONT><FONT COLOR="#000000">} ));</FONT>
+<FONT COLOR="#000000">&gt;&gt; sys.setPortNames(plist(</FONT><FONT COLOR="#a020f0">'field'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'inputs'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'block'</FONT><FONT COLOR="#000000">, {</FONT><FONT COLOR="#a020f0">'myinput3'</FONT><FONT COLOR="#000000">}, </FONT><FONT COLOR="#a020f0">'ports'</FONT><FONT COLOR="#000000">, [1 2], </FONT><FONT COLOR="#a020f0">'names'</FONT><FONT COLOR="#000000">,{</FONT><FONT COLOR="#a020f0">'my port 3-1'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'my port 3-2'</FONT><FONT COLOR="#000000">} ));</FONT>
+<FONT COLOR="#000000">&gt;&gt; sys.setPortDescriptions(plist(</FONT><FONT COLOR="#a020f0">'field'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'inputs'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'block'</FONT><FONT COLOR="#000000">, {</FONT><FONT COLOR="#a020f0">'myinput3'</FONT><FONT COLOR="#000000">}, </FONT><FONT COLOR="#a020f0">'ports'</FONT><FONT COLOR="#000000">, [1 2], </FONT><FONT COLOR="#a020f0">'descriptions'</FONT><FONT COLOR="#000000">,{</FONT><FONT COLOR="#a020f0">'first description'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'second description'</FONT><FONT COLOR="#000000">} ));</FONT>
+<FONT COLOR="#000000">&gt;&gt; sys.setPortUnits(plist(</FONT><FONT COLOR="#a020f0">'field'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'inputs'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'block'</FONT><FONT COLOR="#000000">, {</FONT><FONT COLOR="#a020f0">'myinput3'</FONT><FONT COLOR="#000000">}, </FONT><FONT COLOR="#a020f0">'ports'</FONT><FONT COLOR="#000000">, [1 2], </FONT><FONT COLOR="#a020f0">'units'</FONT><FONT COLOR="#000000">, [unit(</FONT><FONT COLOR="#a020f0">'kg m^-2'</FONT><FONT COLOR="#000000">) unit(</FONT><FONT COLOR="#a020f0">'m'</FONT><FONT COLOR="#000000">)] ));</FONT>
+&gt;&gt; sys.inputs
+
+------ ssmblock/1 -------
+       name: myinput1
+      ports: input 1 &gt; 1 [] [1x1 ssmport]
+description: myinput1 description
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+-------------------------
+------ ssmblock/2 -------
+       name: myinput2
+      ports: input 2 &gt; 1 [] [1x1 ssmport]
+description: 
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+-------------------------
+------ ssmblock/3 -------
+       name: myinput3
+      ports: my port 3-1 [kg m^(-2)], my port 3-2 [m] [1x2 ssmport]
+description: 
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+-------------------------
+
+&gt;&gt;sys.inputs(3).ports
+
+------ ssmport/1 -------
+       name: my port 3-1
+      units: [kg m^(-2)] [1x1 unit]
+description: first description
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+------------------------
+------ ssmport/2 -------
+       name: my port 3-2
+      units: [m] [1x1 unit]
+description: second description
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+------------------------</PRE></DIV><P>
+So far there is no special display function for ssmblocks so the
+description of the ports is not displayed. This may change in the
+future</P>
+<H2>Description whith input/state/outputs names</H2>
+<DIV CLASS="fragment"><PRE>Then a more extensive set of inputs is :
+<FONT COLOR="#000000">&gt;&gt;sys = ssm(plist( </FONT><FONT COLOR="#a020f0">'amats'</FONT><FONT COLOR="#000000">,amats, </FONT><FONT COLOR="#a020f0">'bmats'</FONT><FONT COLOR="#000000">,bmats, </FONT><FONT COLOR="#a020f0">'cmats'</FONT><FONT COLOR="#000000">,cmats, </FONT><FONT COLOR="#a020f0">'dmats'</FONT><FONT COLOR="#000000">,dmats, </FONT><FONT COLOR="#a020f0">'timestep'</FONT><FONT COLOR="#000000">,timestep, </FONT><FONT COLOR="#a020f0">'name'</FONT><FONT COLOR="#000000">,name, </FONT><FONT COLOR="#a020f0">'params'</FONT><FONT COLOR="#000000">,params, </FONT><FONT COLOR="#a020f0">'statenames'</FONT><FONT COLOR="#000000">,statenames, </FONT><FONT COLOR="#a020f0">'inputnames'</FONT><FONT COLOR="#000000">,inputnames, </FONT><FONT COLOR="#a020f0">'outputnames'</FONT><FONT COLOR="#000000">,outputnames ));</FONT>
+&gt;&gt; sys = ssm( amats, bmats, cmats, dmats, timestep, name, params, statenames, inputnames, outputnames );</PRE></DIV><P>
+Still here, the port names are set automatically without any
+description or unit.</P>
+<H2>Complete description</H2>
+<P>example :</P>
+<DIV CLASS="fragment"><PRE><FONT COLOR="#000000">&gt;&gt; name = </FONT><FONT COLOR="#a020f0">'sys'</FONT><FONT COLOR="#000000">;</FONT>
+<FONT COLOR="#000000">&gt;&gt; statenames = {</FONT><FONT COLOR="#a020f0">'ss1'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'ss2'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'ss3'</FONT><FONT COLOR="#000000">};</FONT>
+<FONT COLOR="#000000">&gt;&gt; inputnames = {</FONT><FONT COLOR="#a020f0">'input1'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'input2'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'input3'</FONT><FONT COLOR="#000000">};</FONT>
+<FONT COLOR="#000000">&gt;&gt; outputnames = {</FONT><FONT COLOR="#a020f0">'output1'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'output2'</FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#a020f0">'output3'</FONT><FONT COLOR="#000000">};</FONT>
+&gt;&gt; timestep = 0;
+<FONT COLOR="#000000">&gt;&gt; params = plist({</FONT><FONT COLOR="#a020f0">'OMEGA'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'system frequency'</FONT><FONT COLOR="#000000">}, 2);</FONT>
+&gt;&gt; amats = cell(3,3);
+&gt;&gt; bmats = cell(3,3);
+&gt;&gt; cmats = cell(3,3);
+&gt;&gt; dmats = cell(3,3);
+<FONT COLOR="#000000">&gt;&gt; amats{1,1} = -(sym(</FONT><FONT COLOR="#a020f0">'OMEGA'</FONT><FONT COLOR="#000000">));</FONT>
+&gt;&gt; amats{2,2} = -2;
+&gt;&gt; amats{3,3} = [0 1 -0.05 -0.01];
+&gt;&gt; amats{3,1} = [-1;-3];
+&gt;&gt; bmats{1,1} = 1;
+&gt;&gt; bmats{2,2} = 2;
+&gt;&gt; bmats{3,3} = 3*eye(2);
+&gt;&gt; cmats{1,1} = 1;
+&gt;&gt; cmats{2,2} = 1;
+&gt;&gt; cmats{3,3} = eye(2);
+&gt;&gt; dmats{1,3} = [6 6];
+&gt;&gt; dmats{2,1} = 6;
+&gt;&gt; dmats{3,2} = [6;6];
+<FONT COLOR="#000000">&gt;&gt; sys = ssm(plist( </FONT><FONT COLOR="#0000ff">...</FONT>
+<FONT COLOR="#a020f0"> 'amats'</FONT><FONT COLOR="#000000">,amats, </FONT><FONT COLOR="#a020f0">'bmats'</FONT><FONT COLOR="#000000">,bmats, </FONT><FONT COLOR="#a020f0">'cmats'</FONT><FONT COLOR="#000000">,cmats, </FONT><FONT COLOR="#a020f0">'dmats'</FONT><FONT COLOR="#000000">,dmats, </FONT><FONT COLOR="#0000ff">...</FONT>
+<FONT COLOR="#a020f0"> 'timestep'</FONT><FONT COLOR="#000000">,timestep, </FONT><FONT COLOR="#a020f0">'name'</FONT><FONT COLOR="#000000">,name, </FONT><FONT COLOR="#a020f0">'params'</FONT><FONT COLOR="#000000">,params, </FONT><FONT COLOR="#0000ff">...</FONT>
+<FONT COLOR="#a020f0"> 'statenames'</FONT><FONT COLOR="#000000">,statenames, </FONT><FONT COLOR="#a020f0">'inputnames'</FONT><FONT COLOR="#000000">,inputnames, </FONT><FONT COLOR="#a020f0">'outputnames'</FONT><FONT COLOR="#000000">,outputnames ));</FONT>
+&gt;&gt; sys
+------ ssm/1 -------
+      amats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                [2x1]    []     [2x2]  }  [3x3]
+      mmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      bmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      cmats: {  [1x1]    []      []     
+                 []     [1x1]    []     
+                 []      []     [2x2]  }  [3x3]
+      dmats: {   []      []     [1x2]   
+                [1x1]    []      []     
+                 []     [2x1]    []    }  [3x3]
+   timestep: 0
+     inputs:  [1x3 ssmblock]
+         1 : input1 | input1 &gt; 1 []
+         2 : input2 | input2 &gt; 1 []
+         3 : input3 | input3 &gt; 1 [], input3 &gt; 2 []
+     states:  [1x3 ssmblock]
+         1 : ss1 | ss1 &gt; 1 []
+         2 : ss2 | ss2 &gt; 1 []
+         3 : ss3 | ss3 &gt; 1 [], ss3 &gt; 2 []
+    outputs:  [1x3 ssmblock]
+         1 : output1 | output1 &gt; 1 []
+         2 : output2 | output2 &gt; 1 []
+         3 : output3 | output3 &gt; 1 [], output3 &gt; 2 []
+     params: (OMEGA=2) [1x1 plist]
+    version: $Id: ssm_build_description_content.html,v 1.4 2009/08/28 15:11:53 adrien Exp $
+    Ninputs: 3
+ inputsizes: [1 1 2]
+   Noutputs: 3
+outputsizes: [1 1 2]
+    Nstates: 3
+ statesizes: [1 1 2]
+    Nparams: 1
+isnumerical: false
+       hist: ssm.hist [1x1 history]
+   procinfo: (empty-plist) [1x1 plist]
+   plotinfo: (empty-plist) [1x1 plist]
+       name: sys
+description: 
+    mdlfile: UUID: b30c0d1d-9d09-4fd5-8dc1-8185f8b1c165</PRE></DIV><P>
+<BR>This constructor still
+does not set ports properties (except automatic name) nor the block
+description. <BR>These may be set by the user later on using the
+setter functions above.<BR><BR><BR><BR><BR>
+</P>
+</BODY>
+</HTML>
+  </p>
+
+  <br>
+  <br>
+  <table class="nav" summary="Navigation aid" border="0" width=
+  "100%" cellpadding="0" cellspacing="0">
+    <tr valign="top">
+      <td align="left" width="20"><a href="ssm_building.html"><img src=
+      "b_prev.gif" border="0" align="bottom" alt=
+      "Building Statespace models"></a>&nbsp;</td>
+
+      <td align="left">Building Statespace models</td>
+
+      <td>&nbsp;</td>
+
+      <td align="right">Building from built-in models</td>
+
+      <td align="right" width="20"><a href=
+      "ssm_build_built_in.html"><img src="b_next.gif" border="0" align=
+      "bottom" alt="Building from built-in models"></a></td>
+    </tr>
+  </table><br>
+
+  <p class="copy">&copy;LTP Team</p>
+</body>
+</html>